2022/11/25 更新

写真b

タナベ イチロウ
田邉 一郎
TANABE Ichiro
*大学が定期的に情報更新している項目(その他は、researchmapの登録情報を転載)
所属*
理学部 化学科
理学研究科 化学専攻 博士課程後期課程
理学研究科 化学専攻 博士課程前期課程
職名*
准教授
学位
博士(工学) ( 東京大学 )
研究テーマ*
  • 界面分光化学。検出深さ数十~数千ナノメートルでナノメートルオーダーの分解能をもつ独自の減衰全反射型紫外可視分光法を開発し、物質界面が重要な役割を果たす有機薄膜トランジスタや有機薄膜太陽電池の、機能発現中の界面電子状態を研究する。量子化学計算や分子動力学計算を利用することで、界面での分子論的描像まで明らかにすることを目指す。

  • 学内職務経歴*
    • 2022年4月 - 現在 
      理学部   化学科   准教授
    • 2022年4月 - 現在 
      理学研究科   化学専攻 博士課程前期課程   准教授
    • 2022年4月 - 現在 
      理学研究科   化学専攻 博士課程後期課程   准教授
     

    研究分野

    • ナノテク・材料 / 薄膜、表面界面物性

    • ナノテク・材料 / 複合材料、界面

    • ナノテク・材料 / 機能物性化学

    • ナノテク・材料 / 分析化学

    経歴

    • 2022年4月 - 現在 
      立教大学   理学部 化学科   准教授

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    • 2016年4月 - 2022年3月 
      大阪大学   大学院基礎工学研究科   助教

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    • 2015年4月 - 2016年3月 
      関西学院大学   理工学部   助教

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    • 2014年4月 - 2015年3月 
      日本学術振興会   特別研究員(PD)

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    • 2013年4月 - 2014年3月 
      関西学院大学   理工学部   博士研究員

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    • 2010年4月 - 2013年3月 
      日本学術振興会   特別研究員(DC1)

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    学歴

    • 2010年4月 - 2013年3月 
      東京大学   大学院工学系研究科   応用化学専攻 博士課程

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    • 2008年4月 - 2010年3月 
      東京大学   大学院工学系研究科   応用化学専攻 修士課程

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    • 2004年4月 - 2008年3月 
      東京大学   工学部   応用化学科

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    委員歴

    • 2022年 - 現在 
      日本分析化学会   関東支部若手の会幹事

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      団体区分:学協会

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    • 2016年 - 現在 
      日本分光学会   紫外フロンティア分光部会幹事(会計担当、企画委員)

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    • 2019年 - 2022年3月 
      日本分析化学会   近畿支部幹事

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      団体区分:学協会

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    • 2017年 - 2021年12月 
      ISSS9, Steering Committee (Secretary)

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      団体区分:学協会

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    • 2020年 - 2021年9月 
      日本分析化学会第70年会 実行委員

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    • 2020年 - 2020年9月 
      第14回分子化学討論会 実行委員

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      団体区分:学協会

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    • 2013年 
      ICAVS7, Local Committee

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    受賞

    • 2020年5月  
      日本分光学会 2020年度奨励賞 

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    • 2020年3月  
      第14回 PCCP Prize 

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    • 2019年9月  
      日本分析化学会 2019年度奨励賞 

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    • 2016年5月  
      日本分光学会 平成28年度年次講演会若手講演賞 

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    • 2014年8月  
      IUMRS-ICA Award for Encouragement of Research 

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    • 2014年5月  
      日本分析化学会 第74回討論会若手ポスター賞 

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    • 2013年9月  
      応用物理学会 第74回秋季学術講演会Poster Award 

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    • 2013年8月  
      ICAVS-7 Spectroscopy & Innovation Poster Award 

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    • 2013年3月  
      日本化学会 第93回春季年会学生講演賞 

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    • 2012年6月  
      Yamada Conference LXVI Best Poster Award 

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    論文

    • Local structures and dynamics of interfacial imidazolium-based ionic liquid depending on the electrode potential using electrochemical attenuated total reflectance ultraviolet spectroscopy. 査読有り 国際誌

      Masaya Imai, Ichiro Tanabe, Taiki Sato, Ken-Ichi Fukui

      Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy273   121040 - 121040   2022年5月15日

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      担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

      Recently, ionic liquids (ILs) have attracted attention as prospective electrolytes for Li-ion batteries, with safe performance. Herein, the dynamics of the IL at the electrochemical interface, which is the key to the electrochemical reaction, was monitored using attenuated total reflectance far- and deep-ultraviolet (ATR-FUV-DUV) spectroscopy. An original measurement system, which combined an ATR-FUV-DUV spectrometer with a Kretschmann type (fully metal-coated prism) electrochemical setup, was assembled. Spectral measurements and assignments were performed for the 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([EMIM][TFSI])/Pt electrode (∼7 nm) interface. The incident light in the FUV and DUV regions entered a measurement system comprising an [EMIM][TFSI]/Pt electrode/ATR sapphire prism, and the potential-dependent absorption spectra were measured in the 180-450 nm range. This in-situ spectroscopic technique is unique in that the electronic transition spectra of the interfacial IL can be obtained. By switching the applied potentials, temporal spectral changes (i.e. relaxation signals) were tracked at wavelengths of 450 nm and 221 nm, where the direct electronic absorption of the IL was active and inactive, respectively. Comparing these relaxation times, it was revealed that the absorption signal at 221 nm changed more slowly than that at 450 nm. This indicated that the molecular conformations that affected the electronic absorption of the interfacial ILs changed slowly. Considering the surface-normal dipole selection rule for molecules on a metal surface, it is suggested that the slow changes in the molecular conformations can be ascribed to the potential-dependent interfacial orientations of [EMIM]+.

      DOI: 10.1016/j.saa.2022.121040

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    • Electronic excitation spectra of organic semiconductor/ionic liquid interface by electrochemical attenuated total reflectance spectroscopy 査読有り

      Ichiro Tanabe, Iroha Imoto, Daijiro Okaue, Masaya Imai, Shohei Kumagai, Tatsuyuki Makita, Masato Mitani, Toshihiro Okamoto, Jun Takeya, Ken-ichi Fukui

      Communications Chemistry4 ( 1 )   2021年12月

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      担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Science and Business Media LLC  

      <title>Abstract</title>The interface of organic semiconductor films is of particular importance with respect to various electrochemical devices such as transistors and solar cells. In this study, we developed a new spectroscopic system, namely electrochemical attenuated total reflectance ultraviolet (EC-ATR-UV) spectroscopy, which can access the interfacial area. Ionic liquid-gated organic field-effect transistors (IL-gated OFETs) were successfully fabricated on the ATR prism. Spectral changes of the organic semiconductor were then investigated in relation to the gate voltage application and IL species, and the magnitude of spectral changes was found to correlate positively with the drain current. Additionally, the Stark shifts of not only the organic semiconductor, but also of the IL on the organic semiconductor films were detected. This new method can be applied to other electrochemical devices such as organic thin film solar cells, in which the interfacial region is crucial to their functioning.

      DOI: 10.1038/s42004-021-00525-y

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      その他リンク: http://www.nature.com/articles/s42004-021-00525-y

    • Enhanced Surface Plasmon Resonance Wavelength Shifts by Molecular Electronic Absorption in Far- and Deep-Ultraviolet Regions 査読有り

      Ichiro Tanabe, Yoshito Y. Tanaka, Koji Watari, Wataru Inami, Yoshimasa Kawata, Yukihiro Ozaki

      Scientific Reports10 ( 1 )   2020年12月1日

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      担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)  

      © 2020, The Author(s). In this study, surface plasmon resonance (SPR) wavelength shifts due to molecular electronic absorptions in the far-ultraviolet (FUV, < 200 nm) and deep-ultraviolet (DUV, < 300 nm) regions were investigated by attenuated total reflectance (ATR) spectroscopy. Due to the strong absorption in the DUV region, N,N-dimethylformamide (DMF) significantly increased the SPR wavelength shift of Al film. On the other hand, no such shift enhancement was observed in the visible region for Au film because DMF does not have absorbance compared to non-absorbing materials such as water and alcohols. The enhanced SPR wavelength shift, caused by the overlap between SPR and molecular resonance wavelengths in FUV-DUV region, is expected to result in high sensitivity for resonant materials.

      DOI: 10.1038/s41598-020-66949-z

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    • Attenuated total reflectance far-ultraviolet and deep-ultraviolet spectroscopy analysis of the electronic structure of a dicyanamide-based ionic liquid with Li+ 査読有り

      Masaya Imai, Ichiro Tanabe, Akifumi Ikehata, Yukihiro Ozaki, Ken-ichi Fukui

      PHYSICAL CHEMISTRY CHEMICAL PHYSICS22 ( 38 ) 21768 - 21775   2020年10月

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      担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      The electronic states ofN-butyl-N-methylpyrrolidinium dicyanamide ([BMP][DCA]), a solvated ionic liquid, around Li(+)were investigated using attenuated total reflectance far-ultraviolet and deep-ultraviolet (ATR-FUV-DUV) spectroscopy. The absorption bands ascribed to the [DCA](-)were blue-shifted as the Li(+)concentration increased, and the origin of the shift was explained by the energetic destabilization of the final (excited) molecular orbital using time-dependent density functional theory (TD-DFT) calculations. Using the multivariate curve resolution-alternating least squares (MCR-ALS) algorithm, the obtained spectra were decomposed into two types of [DCA](-)at electronic state level, which were categorised as pure [BMP][DCA] and [DCA](-)affected by Li+. Our results revealed that the number of [DCA](-)with electronic states affected by a Li+, which was termed the electronic coordination number, was similar to 5. This value was different from the coordination number within the first solvation layer, which was similar to 4. Combining the TD-DFT with molecular dynamics simulations, we demonstrated that one [DCA](-)outside the first solvation layer had a different electronic state from that of pure [BMP][DCA]. This is the first successful study that combines ATR-FUV-DUV spectroscopy with MCR-ALS calculations to build a solvation model that describes the electronic states.

      DOI: 10.1039/d0cp03865b

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    • Plasmonic Biosensing with Aluminum Thin Films under the Kretschmann Configuration 査読有り

      Alexander S. Lambert, Santino N. Valiulis, Alexander S. Malinick, Ichiro Tanabe, Quan Cheng

      Analytical Chemistry   2020年6月19日

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      担当区分:責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Chemical Society ({ACS})  

      DOI: 10.1021/acs.analchem.0c01631

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    • Ionic-Liquid-Originated Carrier Trapping Dynamics at the Interface in Electric Double-Layer Organic FET Revealed by Operando Interfacial Analyses 査読有り

      Daijiro Okaue, Ichiro Tanabe, Sakurako Ono, Kota Sakamoto, Taiki Sato, Akihito Imanishi, Yoshitada Morikawa, Jun Takeya, Ken-ichi Fukui

      The Journal of Physical Chemistry C124 ( 4 ) 2543 - 2552   2020年1月30日

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Chemical Society ({ACS})  

      Ionic liquids (ILs) with their high dielectric constants (k) are promising dielectrics of organic field-effect transistors (OFETs). However, it is known that interfacial polarizations of dielectrics sometimes cause carrier trappings. In this paper, we investigated the carrier trapping behavior at the interface by using a benchmark system of electric double-layer OFETs (EDL-OFETs) with high device performance and stability: rubrene single crystal as an organic semiconductor showing high hole career mobility and 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMIM-FSI) as an IL gate dielectric. Apparent bias stress was observed for the system: the operational voltage of the EDL-OFET increased to more than double in similar to 2 h. Operando electrochemical frequency modulation atomic force micros-copy revealed the gradual structuring of the first IL layer facing the carrier-injected rubrene surface. Molecular dynamics (MD) simulations suggested the reorientations of ions in the first IL layer with electrostatic stabilization by forming a patchwork structure. In this stable configuration, negatively charged O and F atoms of the FSI anions pointing to the positively charged rubrene surface come closer, leading to the gradual hole carrier trapping. It was also found that the structured IL layer is deformed and IL-originated bias stress recovers immediately by applying a large OFF-state gate voltage for detrapping the hole carrier.

      DOI: 10.1021/acs.jpcc.9b10636

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    • Correlation between mobility and the hydrogen bonding network of water at an electrified-graphite electrode using molecular dynamics simulation 査読有り

      Masaya Imai, Yasuyuki Yokota, Ichiro Tanabe, Kouji Inagaki, Yoshitada Morikawa, Ken-ichi Fukui

      Physical Chemistry Chemical Physics22 ( 3 ) 1767 - 1773   2020年

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      掲載種別:研究論文(学術雑誌)   出版者・発行元:Royal Society of Chemistry ({RSC})  

      This journal is © the Owner Societies. Focusing on the electric double layer formed at aqueous solution/graphite electrode interfaces, we investigated the relationship between the mobility of interfacial water and its hydrogen bonding networks by using molecular dynamics simulations. We focused on the mobility of the first hydration layer constructed nearest to the electrode. The mobility was determined by calculating the diffusion coefficient which showed an opposite trend to that of the applied potential polarity. The mobility decreased upon positive potentials while showing an increase upon negative potentials, which is rationalized by the strength of the interfacial hydrogen bonding networks.

      DOI: 10.1039/C9CP06013H

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    • Far- and deep-ultraviolet surface plasmon resonance using Al film for efficient sensing of organic thin overlayer 査読有り

      Ichiro Tanabe, Musashi Shimizu, Rikuto Kawabata, Chiaki Katayama, Ken ichi Fukui

      Sensors and Actuators, A: Physical301   2020年1月1日

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      担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)  

      © 2019 Elsevier B.V. Recently, a focus has been placed on plasmonics utilizing ultraviolet light because of its higher energy and shorter wavelength, compared to visible light. Al is a suitable metal for plasmonics in the ultraviolet region. However, Al is easily oxidized, and accurate control for Al film deposition is difficult. In this study, organic thin films were formed on the Al films, and their surface plasmon resonance (SPR) wavelengths were measured by our original attenuated total reflectance spectroscopic system. With an increase in the organic film thickness, the SPR wavelength shifted to longer wavelengths. The minimum detection thickness of the organic overlayer reached 2 nm for three Al films under different conditions (i.e., different Al thickness and oxidation effects), and the spectra were reproduced by simulations based on the Fresnel equations. These results showed the practical advantage of the Al-based SPR sensor without accurate control of the chemical state of the Al film.

      DOI: 10.1016/j.sna.2019.111661

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    • Potential Dependence of Electronic Transition Spectra of Interfacial Ionic Liquids Studied by Newly Developed Electrochemical Attenuated Total Reflectance Spectroscopy 査読有り

      Ichiro Tanabe, Aki Suyama, Taiki Sato, Ken-ichi Fukui

      Analytical Chemistry91 ( 5 ) 3436 - 3442   2019年3月5日

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      担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Chemical Society ({ACS})  

      DOI: 10.1021/acs.analchem.8b04931

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    • Electronic Spectra of Graphene in Far- and Deep-Ultraviolet Region: Attenuated Total Reflection Spectroscopy and Quantum Chemical Calculation Study 査読有り

      Krzysztof B. Bec, Yusuke Morisawa, Kenta Kobashi, Justyna Grabska, Ichiro Tanabe, Yukihiro Ozaki

      JOURNAL OF PHYSICAL CHEMISTRY C122 ( 50 ) 28998 - 29008   2018年12月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

      We measured the electronic spectra of graphene nanostructures (flakes and platelets) extending into the far ultraviolet (FUV) region by attenuated total reflection far- and deep-ultraviolet (ATR-FUV-DUV) spectroscopy in the region of 2.76-8.55 eV (450-145 nm). The major absorption of graphene appears in the DUV region (4.7 eV), as already reported; however, we observed a new peak in the FUV region, visible clearly in the case of flakes at 7.5-7.7 eV (165-161 nm) and less pronounced in the spectrum of the platelets at 6.6-6.7 eV (188-185 rim). Graphene flakes (thickness 1-2 nm; sub micrometers of side dimension) and nanoplatelets (thickness 6-8 nm; several micrometers of side dimension) give notably different ATR absorbance spectra in the spectral region studied. This discrepancy is reduced upon applying mechanical pressure on the samples. These observations can evidence that the morphology as well as electronic structure of graphene can be manifested in the FUV DUV region. Quantum chemical calculations were applied to several molecular models incorporating the expected principal structural features of graphene nanostructures. On the basis of the results of time-dependent density functional theory and Zerner's intermediate neglect of differential overlap (ZINDO) calculations, it was possible to consistently reproduce the experimental spectral variations in terms of both band positions and intensities. The spectral differences result from the differences in the die area, ordering and the number of layers, and structural factors which separate nanoflakes and nanoplatelets. These results provide insights into the probable origins of the spectral variability of graphene nanostructures as well as the molecular orbitals involved in a FUV pi-pi* transition of graphene nanostructures.

      DOI: 10.1021/acs.jpcc.8b08089

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    • Systematic analysis of various ionic liquids by attenuated total reflectance spectroscopy (145-450 nm) and quantum chemical calculations 査読有り

      Ichiro Tanabe, Aki Suyama, Taiki Sato, Ken-Ichi Fukui

      Analyst143 ( 11 ) 2539 - 2545   2018年6月7日

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      担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Royal Society of Chemistry  

      Despite providing rich information on electronic states, the far-ultraviolet (FUV, &lt
      200 nm) and deep-ultraviolet (DUV, &lt
      300 nm) absorption spectra of ionic liquids (ILs) are difficult to obtain without saturation due to very strong analyte absorbance. Herein, FUV-DUV spectra of selected ILs were systematically and easily recorded using an attenuated total reflectance spectrometer and rationalized based on quantum chemical calculations. ILs containing pyrrolidinium or ammonium cations and fluorine-containing anions exhibited weak absorbance below 200 nm that could not be measured by conventional UV-Vis spectroscopy, whereas the corresponding imidazolium-based ILs showed distinct absorption bands that could be reproduced by single-cation-model calculations. On the other hand, imidazolium-based ILs with halide anions showed characteristic charge transfer (CT)-related absorbances. Thus, the above spectroscopic investigations contribute to a fundamental understanding of the electronic processes (e.g., intramolecular excitations and CT transitions) and molecular designs used in electrochemical devices.

      DOI: 10.1039/c8an00563j

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    • Far-ultraviolet spectral changes of titanium dioxide with gold nanoparticles by ultraviolet and visible light 査読有り

      Ichiro Tanabe, Yuji Kurawaki

      Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy197   103 - 106   2018年5月15日

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      担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier B.V.  

      Attenuated total reflectance spectra including the far-ultraviolet (FUV, ≤ 200 nm) region of titanium dioxide (TiO2) with and without gold (Au) nanoparticles were measured. A newly developed external light-irradiation system enabled to observe spectral changes of TiO2 with Au nanoparticles upon light irradiations. Absorption in the FUV region decreased and increased by the irradiation with ultraviolet and visible light, respectively. These spectral changes may reflect photo-induced electron transfer from TiO2 to Au nanoparticles under ultraviolet light and from Au nanoparticles to TiO2 under visible light, respectively.

      DOI: 10.1016/j.saa.2017.11.011

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    • Rydberg transitions as a probe for structural changes and phase transition at polymer surfaces: an ATR-FUV-DUV and quantum chemical study of poly(3-hydroxybutyrate) and its nanocomposite with graphene 査読有り

      Krzysztof B. Bec, Yusuke Morisawa, Kenta Kobashi, Justyna Grabska, Ichiro Tanabe, Erika Tanimura, Harumi Sato, Marek J. Wojcik, Yukihiro Ozaki

      PHYSICAL CHEMISTRY CHEMICAL PHYSICS20 ( 13 ) 8859 - 8873   2018年4月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      We investigated the surface (<50 nm) of poly(3-hydroxybutyrate) (PHB) and its nanocomposite with graphene by attenuated total reflection far- and deep-ultraviolet (ATR-FUV-DUV; 145-300 nm; 8.55-4.13 eV) spectroscopy and quantum mechanical calculations. The major absorption of polymers occurs in FUV and is related to Rydberg transitions. ATR-FUV-DUV spectroscopy allows for direct measurements of these transitions in the solid phase. Using ATR-FUV-DUV spectroscopy, periodic density functional theory (DFT) and time-dependent DFT (TD-DFT), we explained the origins of the FUV-DUV absorption of PHB and provided insights into structural changes of PHB which occur upon formation of a graphene nanocomposite and upon heating of the pure polymer. The structural changes cause specific and gradual spectral variations in FUV-DUV. We systematically studied the relaxation of the polymer helix and concluded that the common feature of all models of the unfolded helix lies in a specific and consistent FUV-DUV spectral signature. Relaxed structures feature a blue-shift of the major FUV transition (non-bonding molecular orbital to Rydberg 3p and to *) as compared with crystalline PHB. The FUV absorption of the relaxed structures was determined to be significantly stronger than that of the crystalline state. These results are consistent with the observed temperature-dependent spectra of the pure PHB. The simulation of the thermal expansion of the crystalline polymer by a periodic-DFT study allows us to exclude the possibility that spectral variations observed experimentally are influenced by changes in the crystalline phase. We concluded that the crystallinity of PHB at the sample surface increases with an increase in graphene content in the nanocomposite. However, it is unlikely that the polymer structure inside the crystal is affected; instead the FUV-DUV spectral variations result from changes in the polymer morphology that occur at the sample surface. The phase transition of PHB is affected by temperature and addition of graphene content. These changes are likely to be the opposite of those occurring in the bulk sample.

      DOI: 10.1039/c7cp07271f

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    • Far-and deep-ultraviolet surface plasmon resonance sensors working in aqueous solutions using aluminum thin films 査読有り

      Tanabe, Ichiro, Tanaka, Yoshito Y, Watari, Koji, Hanulia, Taras, Goto, Takeyoshi, Inami, Wataru, Kawata, Yoshimasa, Ozaki, Yukihiro

      Scientific Reports7   2017年

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      担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Nature Publishing Group  

      Surface plasmon resonance (SPR) sensors detect refractive index changes on metal thin films and are frequently used in aqueous solutions as bio-and chemical-sensors. Recently, we proposed new SPR sensors using aluminum (Al) thin films that work in the far-and deep-ultraviolet (FUV-DUV, 120-300 nm) regions and investigated SPR properties by an attenuated total reflectance (ATR) based spectrometer. The FUV-DUV-SPR sensors are expected to have three advantages compared to visible-SPR sensors: higher sensitivity, material selectivity, and surface specificity. However, in this study, it was revealed that the Al thin film on a quartz prism cannot be used as the FUV-DUV-SPR sensor in water solutions. This is because its SPR wavelength shifts to the visible region owing to the presence of water. On the other hand, the SPR wavelength of the Al thin film on the sapphire prism remained in the DUV region even in water. In addition, the SPR wavelength shifted to longer wavelengths with increasing refractive index on the Al thin film. These results mean that the Al thin film on the sapphire prism can be used as the FUV-DUV-SPR sensor in solutions, which may lead to the development of novel and sophisticated SPR sensors.

      DOI: 10.1038/s41598-017-06403-9

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    • Aluminum film thickness dependence of surface plasmon resonance in the Far- and deep-ultraviolet regions 査読有り

      Ichiro Tanabe, Yoshito Y. Tanaka, Koji Watari, Taras Hanulia, Takeyoshi Goto, Wataru Inami, Yoshimasa Kawata, Yukihiro Ozaki

      Chemistry Letters46 ( 10 ) 1560 - 1563   2017年

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      担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Chemical Society of Japan  

      Aluminum film thickness dependence of surface plasmon resonance (SPR) in the far- and deep-ultraviolet regions (170300 nm) was revealed using an attenuated total reflectance spectrometer. In the far-ultraviolet region (&lt
      200 nm), films of thicknesses 23 and 9 nm showed strong SPR excitations in air and 1,1,1,3,3,3-hexafluoro-2-propanol, which were reproduced by simulations based on the Fresnel equations, respectively. Therefore, Al-SPR sensors are expected to work both in air and in liquids by controlling the film thickness.

      DOI: 10.1246/cl.170635

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    • Site-Selective Plasmonic Etching of Silver Nanocubes 査読有り

      Saito, Koichiro, Tanabe, Ichiro, Tatsuma, Tetsu

      The journal of physical chemistry letters7 ( 21 ) 4363 - 4368   2016年

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Chemical Society  

      Plasmon-induced charge separation (PIGS) at the interface between a plasmonic nanoparticle and semiconductor is now widely used for photovoltaics and photocatalysis. Here we take advantage of PIGS for site-selective nanoetching of silver nanocubes on TiO2 beyond the diffraction limit. A silver nanocube exhibits two resonance modes localized at the top and bottom of the nanocube (distal and proximal modes, respectively) when it is placed on TiO2. We achieved selective etching at the top and the bottom of the nanocubes by PIGS based on the distal and proximal modes, respectively. The site-selective nanophotonic etching reveals that the anodic reaction involved in PIGS is induced by the plasmonic near field, which causes an external photoelectric effect. In particular, the distal mode etching at the top edges is explained in terms of ejection of energetic electrons (or hot electrons) from the distal site to TiO2 across the nanocube.

      DOI: 10.1021/acs.jpclett.6b02393

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    • Direct optical measurements of far-and deep-ultraviolet surface plasmon resonance with different refractive indices 査読有り

      Tanabe, Ichiro, Tanaka, Yoshito Y, Ryoki, Takayuki, Watari, Koji, Goto, Takeyoshi, Kikawada, Masakazu, Inami, Wataru, Kawata, Yoshimawa, Ozaki, Yukihiro

      Optics express24 ( 19 ) 21886 - 21896   2016年

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      担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Optical Society of America  

      The surface plasmon resonance (SPR) of Al thin films was investigated by varying the refractive index of the environment near the films in the far-ultraviolet (FUV, 120-200 nm) and deep-ultraviolet (DUV, 200-300 nm) regions. An original FUV-DUV spectrometer that adopts an attenuated total reflectance (ATR) system was used. The measurable wavelength range was down to the 180 nm, and the environment near the Al surface could be controlled. The resultant spectra enabled the dispersion relationship of Al-SPR in the FUV and DUV regions to be obtained. In the presence of 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) on the Al film, the angle and wavelength of the SPR became larger and longer, respectively, compared to those in air. These shifts correspond well with the results of simulations performed using Fresnel equations. (C) 2016 Optical Society of America

      DOI: 10.1364/OE.24.021886

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    • Electronic absorption spectra of imidazolium-based ionic liquids studied by far-ultraviolet spectroscopy and quantum chemical calculations 査読有り

      Tanabe, Ichiro, Kurawaki, Yuji, Morisawa, Yusuke, Ozaki, Yukihiro

      Physical Chemistry Chemical Physics18 ( 32 ) 22526 - 22530   2016年

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      担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Royal Society of Chemistry  

      Electronic absorption spectra of imidazolium-based ionic liquids were studied by far- and deep-ultraviolet spectroscopy and quantum chemical calculations. The absorption spectra in the 145-300 nm region of imidazolium-based ionic liquids, [C(n)mim](+)[BF4](-) (n = 2, 4, 8) and [C(4)mim](+)[PF6](-), were recorded using our original attenuated total reflectance (ATR) system spectrometer. The obtained spectra had two definitive peaks at similar to 160 and similar to 210 nm. Depending on the number of carbon atoms in the alkyl side chain, the peak wavelength around 160 nm changed, while that around 210 nm remained at almost the same wavelength. Quantum chemical calculation results based on the time-dependent density functional theory (TD-DFT) also showed the corresponding peak shifts. In contrast, there was almost no significant difference between [C(4)mim](+)[BF4](-) and [C(4)mim](+)[PF6](-), which corresponded with our calculations. Therefore, it can be concluded that the absorption spectra in the 145-300 nm region are mainly determined by the cations when fluorine-containing anions are adopted. In addition, upon addition of organic solvent (acetonitrile) to [C(4)mim](+)[BF4](-), small peak shifts to the longer wavelength were revealed for both peaks at similar to 160 and similar to 210 nm. The peak shift in the deep-ultraviolet region (<= 200 nm) in the presence of the solvent, which indicates the change of electronic states of the ionic liquid, was experimentally observed for the first time by using the ATR spectrometer.

      DOI: 10.1039/c6cp02930b

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    • Microspectroscopy--promising techniques to characterize phosphorus in soil 査読有り

      Vogel, Christian, Rivard, Camille, Tanabe, Ichiro, Adam, Christian

      Communications in Soil Science and Plant Analysis47 ( 18 ) 2088 - 2102   2016年

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Taylor \& Francis  

      Phosphorus (P) is an essential element for all forms of life and is applied as fertilizer in agriculture. The P availability for plants may be highly dependent on the chemical state of P in fertilizers and soils; however, the nature of this dependence remains obscure due to the limitations of generally applied wet chemical and instrumental analytical approaches. This paper focuses on recently developed infrared, Raman, ultraviolet and X-ray microspectroscopic techniques for the characterization of P in soil. Microspectroscopic techniques have the advantage that discrete P phases can be distinguished and characterized even if their mass fractions are very low. However, only small volumes of soil can be analyzed by microspectroscopic methods hence a combination of macro-and microspectroscopic techniques is a promising concept.

      DOI: 10.1080/00103624.2016.1228942

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    • Structural evolution of graphene in air at the electrical breakdown limit 査読有り

      Son, Jangyup, Choi, Minkyung, Choi, Heechae, Kim, Sang Jin, Kim, Seungchul, Lee, Kwang-Ryeol, Vantasin, Sanpon, Tanabe, Ichiro, Cha, Jongin, Ozaki, Yukihiro, others

      Carbon99   466 - 471   2016年

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Elsevier  

      In application of graphene to real electronics, understanding the mechanism of the electrical breakdown of the graphene in harsh environments should precede many activities in tamed conditions. In this article, we report the unusual structural evolution of microbridge graphene in air near the electrical current-breakdown limit. In-situ micro-Raman study revealed that Joule heating near the electrical breakdown gave rise to a substantial structural evolution: a previously unknown broad amorphous-like and partially reversible phase at an on-and off-current of similar to 3.0 X 10(8) A/cm(2), which finally drove the phase to the electrical current-breakdown. Our calculations suggest that the phase originates from the broken symmetry caused by defect formations during Joule heating. In particular, these formations are bonds of carbon-oxygen and vacancies-oxygen. A collection of energetically favorable vacancies-oxygen pairs results in porous graphene, and its evolution can be the key to understanding how the breakdown starts and propagates in graphene under high current density in air. (C) 2015 Elsevier Ltd. All rights reserved.

      DOI: 10.1016/j.carbon.2015.11.075

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    • Far-and Deep-UV Spectroscopy of Semiconductor Nanoparticles Measured Based on Attenuated Total Reflectance spectroscopy 査読有り

      Tanabe, Ichiro, Yamada, Yosuke, Ozaki, Yukihiro

      ChemPhysChem17 ( 4 ) 516 - 519   2016年

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      担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-V C H VERLAG GMBH  

      Far- and deep-ultraviolet spectra (150-300nm) of semiconductor nanoparticles (zinc oxide and zinc sulfide) are successfully measured by using attenuated total reflectance (ATR) spectroscopy, and analyzed using finite-difference time-domain (FDTD) simulations. The obtained spectra show good consistency with earlier synchrotron-radiation spectra and with theoretical calculations. The FDTD simulation results show that the present system collected the correct spectra. In the present system, the obtained spectra are affected by the real part n of the complex refractive index more strongly than the imaginary part k. It is also revealed both experimentally and theoretically that spectral intensities of the semiconductor nanoparticles are approximately one tenth those of liquid samples. These results provide insights into the far- and deep-ultraviolet spectroscopy based on the ATR system, and show the general applicability of our original ATR spectroscopy to semiconductor nanoparticles. The system needs neither high vacuum nor much space, and enables rapid and systematic investigation of the electronic states of various materials.

      DOI: 10.1002/cphc.201500992

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    • Semiconductor-driven "turn-off" surface-enhanced Raman scattering spectroscopy: application in selective determination of chromium(VI) in water 査読有り

      Wei Ji, Yue Wang, Ichiro Tanabe, Xiaoxia Han, Bing Zhao, Yukihiro Ozaki

      CHEMICAL SCIENCE6 ( 1 ) 342 - 348   2015年

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      Semiconductor materials have been successfully used as surface-enhanced Raman scattering (SERS)-active substrates, providing SERS technology with a high flexibility for application in a diverse range of fields. Here, we employ a dye-sensitized semiconductor system combined with semiconductor-enhanced Raman spectroscopy to detect metal ions, using an approach based on the "turn-off" SERS strategy that takes advantage of the intrinsic capacity of the semiconductor to catalyze the degradation of a Raman probe. Alizarin red S (ARS)-sensitized colloidal TiO2 nanoparticles (NPs) were selected as an example to show how semiconductor-enhanced Raman spectroscopy enables the determination of Cr(VI) in water. Firstly, we explored the SERS mechanism of ARS-TiO2 complexes and found that the strong electronic coupling between ARS and colloidal TiO2 NPs gives rise to the formation of a ligand-to-metal charge transfer (LMCT) transition, providing a new electronic transition pathway for the Raman process. Secondly, colloidal TiO2 nanoparticles were used as active sites to induce the self-degradation of the Raman probe adsorbed on their surfaces in the presence of Cr(VI). Our data demonstrate the potential of ARS-TiO2 complexes as a SERS-active sensing platform for Cr(VI) in an aqueous solution. Remarkably, the method proposed in this contribution is relatively simple, without requiring complex pretreatment and complicated instruments, but provides high sensitivity and excellent selectivity in a high-throughput fashion. Finally, the ARS-TiO2 complexes are successfully applied to the detection of Cr(VI) in environmental samples. Thus, the present work provides a facile method for the detection of Cr(VI) in aqueous solutions and a viable application for semiconductor-enhanced Raman spectroscopy based on the chemical enhancement they contribute.

      DOI: 10.1039/c4sc02618g

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    • Semiconductor-enhanced Raman scattering for highly robust SERS sensing: the case of phosphate analysis 査読有り

      Wei Ji, Wei Song, Ichiro Tanabe, Yue Wang, Bing Zhao, Yukihiro Ozaki

      CHEMICAL COMMUNICATIONS51 ( 36 ) 7641 - 7644   2015年

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      Quantitative analysis of phosphate anions was achieved by measurement of "turn-off" SERS based on the first-layer effect of a chemical mechanism. More importantly, our results demonstrate that it is possible, by means of semiconductor-enhanced Raman scattering, to enhance the SERS sensing performance including stability and reproducibility.

      DOI: 10.1039/c5cc02395e

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    • Fabrication of a highly sensitive surface-enhanced Raman scattering substrate for monitoring the catalytic degradation of organic pollutants 査読有り

      Song, Wei, Ji, Wei, Vantasin, Sanpon, Tanabe, Ichiro, Zhao, Bing, Ozaki, Yukihiro

      Journal of Materials Chemistry A3 ( 25 ) 13556 - 13562   2015年

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Royal Society of Chemistry  

      In this paper, we demonstrate a simple and reliable two-step strategy based on an electrospinning technique combined with in situ calcination for the fabrication of ZnO nanofibers deposited on a silver foil surface. These nanofibers are used as a novel sensitive surface-enhanced Raman scattering (SERS) substrate. The strong interactions between ZnO nanofibers and silver foil afford continuous delocalized surface plasmons, resulting in localization of the electric field at the gap between the ZnO nanofibers and silver foil; thus, the exciton-plasmon interactions between ZnO nanofibers and the silver foil surface contribute to the enhanced scattering, generating a large electromagnetic field enhancement. In addition, the ZnO nanofibers deposited on the silver foil surface exhibit enhanced photocatalytic activity toward the degradation of organic pollutants because of the charge separation effect and increase in the lifetime of the photogenerated excitons under ultraviolet light irradiation; thus, this new substrate can be used as a SERS substrate for determining the catalytic activity and reaction kinetics during the photodegradation of organic pollutants.

      DOI: 10.1039/c5ta01974e

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    • Imaging of Hydrophilicity and its Inhomogeneity on a Titanium Dioxide Film Exposed to Ultraviolet Irradiation Using a Newly Developed Near-Infrared Camera 査読有り

      Tanabe, Ichiro, Ishikawa, Daitaro, Furukawa, Daiki, Ishigaki, Mika, Goto, Takeyoshi, Morishima, Tetsu, Okuno, Toshiaki, Ozaki, Yukihiro

      Applied spectroscopy69 ( 11 ) 1251 - 1256   2015年

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      担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:SAGE Publications Sage UK: London, England  

      This study has investigated hydrophilicity changes and their inhomogeneity of TiO2 films on Pyrex glasses by near-infrared (NIR) spectral imaging. Near-infrared spectra of TiO2 films in the 9000-4000 cm(-1) region were measured using a newly developed NIR camera named Compovision. A band in the 5400-4800 cm(-1) region, which is assigned to a combination (v(2) + v(3)) mode of bending (v(2)) and antisymmetric stretching (v(3)) modes of the H2O molecule, was clearly identified and its intensity increased with time in the air. It is interesting that the increased rate rose with ultraviolet (UV) light irradiation (300-400 nm, 1 mW cm(-2)) compared to without UV light irradiation. This result suggested that the hydrophilicity of TiO2 was enhanced about twice upon the UV light irradiation. Moreover, the NIR images clarified spatial distributions of the hydrophilicity on the TiO2 surface with a significantly wide area (20 x 40 mm) and a high speed (within 5 s for one image). This rapid imaging system enabled us to detect the hydrophilicity change during only 1 min. The potential of this camera is quite superior, not only for basic research, but also for diverse industrial applications.

      DOI: 10.1366/15-07861

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    • Tip-enhanced Raman spectroscopy of bradykinin and its B-2 receptor antagonists adsorbed onto colloidal suspended Ag nanowires 査読有り

      D. Swiech, I. Tanabe, S. Vantasin, D. Sobolewski, Y. Ozaki, A. Prahl, S. Mackowski, E. Proniewicz

      PHYSICAL CHEMISTRY CHEMICAL PHYSICS17 ( 35 ) 22882 - 22892   2015年

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      The tip-enhanced Raman scattering (TERS) spectra of bradykinin (BK) and its potent B-2 BK receptor antagonists, [D-Arg(0), Hyp(3), Thi(5,8), L-Pip(7)] BK and [D-Arg(0), Hyp(3), Thi(5), D-Phe(7), L-Pip(8)] BK, approximately with a size of about 40 nm, adsorbed onto colloidal suspended Ag nanowires with diameter in the range of 350-500 nm and length of 2-50 mu m were recorded. The metal surface plasmon resonance and morphology of the Ag nanowires were studied by ultraviolet-visible (UV-Vis) spectroscopy and scanning electron microscopy (SEM). Briefly, it was shown that two C-terminal amino acids of BK and [D-Arg(0), Hyp(3), Thi(5),8, L-Pip(7)] BK are involved in the interaction with the colloidal suspended Ag nanowire surface, whereas three last amino acids of the [D-Arg(0), Hyp(3,) Thi(5), D-Phe(7), L-Pip(8)] BK sequence attached the Ag surface. Thus, BK adsorbs on the colloidal suspended Ag nanowires mainly through the Phe(5/8) ring (tilted orientation) and the one oxygen atom of the carboxylate group and the H2N-C-NH-CH2- fragment of Arg(9). In the case of [D-Arg(0), Hyp(3), Thi(5,8), L-Pip(7)] BK, the Thi(8) ring (through the lone electron pair on the sulfur atom) and the both oxygen atoms of the carboxylate group and the amine group of Arg(9) mainly participated in the interaction with the Ag nanowire surface. For [D-Arg(0), Hyp(3), Thi(5), D-Phe(7), L-Pip(8)] BK, the D-Phe(7) ring, the Pip(8) ring, and the Arg(9) side-chain assisted in the peptide interaction with the Ag surface. The obtained results emphasize the importance of the C-terminal part of these peptides in the adsorption process onto the colloidal suspended Ag nanowires.

      DOI: 10.1039/c5cp03438h

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    • Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy 査読有り

      Kanet Wongravee, Harnchana Gatemala, Chuchaat Thammacharoen, Sanong Ekgasit, Sanpon Vantasin, Ichiro Tanabe, Yukihiro Ozaki

      RSC ADVANCES5 ( 2 ) 1391 - 1397   2015年

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      The potential of a nanoporous Ag microstructure (np-AgMs) for use as a single particle for surface-enhanced Raman scattering spectroscopy (SERS), with the added advantages of being easy to manipulate and reusable, was successfully demonstrated. The np-AgMs with interconnected pore and controllable pore size were fabricated from symmetric hexapod AgCl via a galvanic replacement reaction in NaCl solution with zinc (Zn) as the sacrificed metal. The clean surface of np-AgMs enables rapid surface functionalization with easy handling and sample preparation as no particle aggregation occurs. The SERS acquisition spots on the np-AgMs can be visually selected using a normal Raman microscope. SERS spectra of p-aminothiophenol (PATP) with a concentration range of 10 (8)-10 (3) M can be achieved. The position-dependent enhancement of np-AgMs was expendably evaluated. The signal-position correlation was confirmed by electric filed enhancement obtained from Finite-difference time-domain (FDTD) calculation. In addition, the highly stable substrate showed insignificant loss of the enhanced Raman signal after several cycles of chemical re-generation. Finally, the potential application of np-AgMs in label-free detection of biomolecules including hemoprotein, protein without chromophore and DNA strains at low concentration of 500 mu g mL(-1) was demonstrated.

      DOI: 10.1039/c4ra11890a

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    • The effects of Au nanoparticle size (5-60 nm) and shape (sphere, rod, cube) over electronic states and photocatalytic activities of TiO2 studied by far- and deep-ultraviolet spectroscopy 査読有り

      Ichiro Tanabe, Takayuki Ryoki, Yukihiro Ozaki

      RSC ADVANCES5 ( 18 ) 13648 - 13652   2015年

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      担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      Absorption spectra of anatase and rutile TiO2 modified with various sizes of Au nanospheres (5-60 nm) in the 150-300 nm region were measured by using attenuated total reflection spectroscopy. The smaller Au nanospheres induced larger spectral changes, which mean larger electronic state changes and higher charge-separation efficiency enhancements. In fact, TiO2 with the smaller Au nanospheres showed the higher photocatalytic activities. In contrast, although Au nanorods with various aspect ratios or Au nanocubes were deposited instead of Au nanospheres on TiO2, their spectra (i.e. electronic states) were not significantly changed. Therefore, it was revealed that while there was little shape dependence, the smaller Au nanoparticles induced the larger electronic state change. This may be due to the difference in the potential gradient generated in the interfacial region between TiO2 and the metal, and the smaller Au nanoparticle deposition leads to the higher photocatalytic activities.

      DOI: 10.1039/c4ra12503g

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    • Sensitive marker bands for the detection of spin states of heme in surface-enhanced resonance Raman scattering spectra of metmyoglobin 査読有り

      Yasutaka Kitahama, Masatoshi Egashira, Toshiaki Suzuki, Ichiro Tanabe, Yukihiro Ozaki

      ANALYST139 ( 24 ) 6421 - 6425   2014年12月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      Surface-enhanced resonance Raman scattering (SERRS) spectra of myoglobin (Mb) with various ligands were measured. In the resonance Raman scattering (RRS) spectra, peaks at around 1610 and 1640 cm(-1) have so far been used to discriminate between the heme iron in a high or low spin state. In the SERRS spectra, however, the spin state cannot be distinguished by the corresponding peaks. Alternatively, the intensity ratio of the SERRS peak at 1560 cm(-1) to that at 1620 cm(-1) was applied to detect the spin states sensitively (1.5 x 10(5) times compared with the RRS): namely, a high ratio was obtained from met-Mb in the high spin state at pH &lt;= 7 except for in a strong acid solution. The different marker bands between the SERRS and RRS spectra may be due to the enhancement order from the surface selection rule.

      DOI: 10.1039/c4an01516a

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    • Tip-Enhanced Raman Scattering of the Local Nanostructure of Epitaxial Graphene Grown on 4H-SiC (000(1)over-bar) 査読有り

      Sanpon Vantasin, Ichiro Tanabe, Yoshito Tanaka, Tamitake Itoh, Toshiaki Suzuki, Yasunori Kutsuma, Koji Ashida, Tadaaki Kaneko, Yukihiro Ozaki

      JOURNAL OF PHYSICAL CHEMISTRY C118 ( 44 ) 25809 - 25815   2014年11月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

      Step, ridge, and crack submicro/nanostructures of epitaxial graphene on 4H-SiC (000 (1) over bar) were characterized using tip-enhanced Raman scattering (TERS) spectroscopy. The nanostructures were created during graphene synthesis due to a difference in the thermal expansion coefficient of graphene and SiC. These structures are a distinctive property of epitaxial graphene, together with other desirable properties, such as large graphene sheet and minimal defects. The results of this study illustrate that the exceptional spatial resolution of TERS allows spectroscopic measurements of individual nanostructures, a feat which normal Raman spectroscopy is not capable of. By analyzing TERS spectra, the change of local strain on the nanoridge and decreased graphene content in the submicrometer crack were detected. Using G' band positions in the TERS spectra, the strain difference between the ridge center and flat area was calculated to be 1.6 x 10(3) and 5.8 x 10(4) for uniaxial and biaxial strain, respectively. This confirms the proposed mechanism in previous researches that nanoridges on epitaxial graphene form as a relief against compressive strain. With this study, we demonstrate that TERS is a powerful technique for the characterization of individual local nanostructures on epitaxial graphene.

      DOI: 10.1021/jp508730y

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    • Photoinduced Multiple Spectral Changes of Single Plasmonic Gold Nanospheres by the Aid of Coordination 査読有り

      Ichiro Tanabe, Tetsu Tatsuma

      CHEMISTRY LETTERS43 ( 6 ) 931 - 933   2014年6月

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      担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CHEMICAL SOC JAPAN  

      One or both of two localized surface plasmon modes (full-surface mode and interface mode) of a commercially available single Au nanosphere on TiO2 are excited, and the corresponding spectral changes are induced in the presence of thiocyanate. Similar spectral changes can be simulated by assuming site-selective oxidation of the Au nanosphere by plasmon-induced charge separation (PICS).

      DOI: 10.1246/cl.140153

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    • Prevention of Photooxidation of Deoxymyoglobin and Reduced Cytochrome c during Enhanced Raman Measurements: SERRS with Thiol-Protected Ag Nanoparticles and a TERS Technique 査読有り

      Ichiro Tanabe, Masatoshi Egashira, Toshiaki Suzuki, Takeyoshi Goto, Yukihiro Ozaki

      JOURNAL OF PHYSICAL CHEMISTRY C118 ( 19 ) 10329 - 10334   2014年5月

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      担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

      Resonance Raman, surface-enhanced resonance Raman scattering (SERBS), and tip-enhanced Raman scattering (TERS) spectra were acquired for deoxymyoglobin (deoxy-Mb) and reduced cytochrome c (reduced Cyt c). Two kinds of Ag nanoparticles (citrate-reduced Ag and thiol-protected) were used for the SERRS measurements. The SERRS spectra could be obtained even when the concentration and laser power were respectively less than a thousandth part and hundredth part of those of the corresponding resonance Raman spectral measurements, demonstrative of the remarkably high sensitivity of SERRS spectroscopy. However, the oxidation of deoxy-Mb (Fe2+) and reduced Cyt c to met-Mb (Fe3+) and oxidized Cyt c, respectively, during the acquisition of the SERRS spectra using citrate-reduced Ag nanoparticles limited the analysis of the proteins in their initial oxidation state. Oxidation was induced by the photocatalytic activity of the citrate reduced Ag nanoparticles upon irradiation with incident laser light. Oxidation was effectively prevented by using thiol-protected Ag nanoparticles for the SERRS measurement or by employing TERS measurements, where the molecules and Ag nanoparticles did not make direct contact, thus preventing the oxidation reactions. The function of heme proteins is strongly related to their oxidation states; thus, it is crucial to obtain Raman spectra in the native oxidation states while circumventing the possibility of photooxidation. From this perspective, SERRS employing thiol-protected Ag nanoparticles and TERS are essential techniques for Raman measurements. In particular, TERS is a developing technique, and this study demonstrates its suitability for acquiring enhanced Raman spectra of heme proteins with nanoscale spatial resolution while preventing photooxidation.

      DOI: 10.1021/jp502981e

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    • Significant enhancement of photocatalytic activity of rutile TiO2 compared with anatase TiO2 upon Pt nanoparticle deposition studied by far-ultraviolet spectroscopy 査読有り

      Ichiro Tanabe, Takayuki Ryoki, Yukihiro Ozaki

      PHYSICAL CHEMISTRY CHEMICAL PHYSICS16 ( 17 ) 7749 - 7753   2014年

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      担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      Absorption spectra of anatase and rutile TiO2 in the 150-300 nm region before and after the deposition of Pt nanoparticles were measured. For anatase TiO2, the spectral intensity in the longer wavelength region decreased (&gt;similar to 210 nm), while that in the shorter wavelength region increased (&lt;similar to 210 nm). In particular, spectral band intensity in the far-ultraviolet (FUV) region (similar to 160 nm) was increased. In contrast, the spectral intensity of rutile TiO2 increased over the entire wavelength region under investigation. Rutile TiO2 showed a spectral band at a longer wavelength region (similar to 170 nm) than anatase TiO2, and the difference in the band wavelengths in the FUV region was due to the differences in the electronic structures of their phase. The decrease and increase in the intensity upon the Pt nanoparticle deposition suggest electron transfer from the TiO2 to Pt nanoparticles and enhancement of charge-separation, respectively. The photocatalytic activity of rutile TiO2, as evaluated by a photo-degradation reaction of methylene blue, increased more than that of anatase TiO2 upon the deposition of Pt nanoparticles. Thus, we concluded that the charge-separation efficiency of rutile TiO2 is enhanced relative to that of anatase TiO2 upon the deposition of Pt nanoparticles.

      DOI: 10.1039/c4cp00329b

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    • Consistent changes in electronic states and photocatalytic activities of metal (Au, Pd, Pt)-modified TiO2 studied by far-ultraviolet spectroscopy 査読有り

      Ichiro Tanabe, Yukihiro Ozaki

      CHEMICAL COMMUNICATIONS50 ( 17 ) 2117 - 2119   2014年

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      担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      Absorption spectra (150-300 nm) of TiO2 and TiO2 modified with metal (Pt, Pd, and Au) nanoparticles were systematically measured using an attenuated total reflection-far ultraviolet spectrometer. The deposition of metal nanoparticles altered the spectral shape and intensity, indicating changes in the electronic states and photocatalytic activities of TiO2.

      DOI: 10.1039/c3cc48446g

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    • Preparation of Thin Poly(vinyl chloride) Films with Size-controlled Nanopores 査読有り

      Ichiro Tanabe, Hajime Yasuda, Tetsu Tatsuma

      CHEMISTRY LETTERS42 ( 9 ) 966 - 968   2013年9月

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      担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CHEMICAL SOC JAPAN  

      Thin poly(vinyl chloride) films with size-controlled nanopores (40-150 nm diameter) are prepared by a new and simple method on ITO-coated glass plates and TiO2 substrates by using monodisperse Au nanoparticles. These films are expected to be applied to nanomasks for nanoelectrode ensembles and templates for deposition of size-controlled metal nanoparticles.

      DOI: 10.1246/cl.130371

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    • Plasmon-induced oxidation of gold nanoparticles on TiO2 in the presence of ligands 査読有り

      Yohei Konishi, Ichiro Tanabe, Tetsu Tatsuma

      DALTON TRANSACTIONS42 ( 45 ) 15937 - 15940   2013年

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      The mechanism of plasmon-induced charge separation of gold nanoparticles (Au NPs) on TiO2 was investigated with the help of anionic ligands. Au NPs are oxidized in the presence of KX (X = SCN, Br or Cl), chiefly via direct oxidation to [AuX4](-). The reactivity of Au NPs depends on the solution pH, the type of anion ligands and the excitation wavelength, suggesting that the photopotential of Au NPs during plasmon-induced charge separation depends on both the flatband potential of TiO2 and the energy of irradiated photons. The results indicate that the reactivity and efficiency of the plasmon-induced charge separation and accompanying reactions can be tuned and optimized by changing those factors.

      DOI: 10.1039/c3dt51495a

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    • Stable spectral dip formation and multicolour changes of plasmonic gold nanoparticles on TiO2 査読有り

      Yohei Konishi, Ichiro Tanabe, Tetsu Tatsuma

      CHEMICAL COMMUNICATIONS49 ( 6 ) 606 - 608   2013年

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      Spectral dip formation at arbitrary wavelengths and the corresponding multicolour changes were achieved by using plasmonic Au nanoparticles on TiO2, based on plasmon-induced charge separation and a coordination effect of iodide ions. The dips were stable in air under white light, in marked contrast to the case of conventional Ag nanoparticles.

      DOI: 10.1039/c2cc37854j

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    • Plasmonic Manipulation of Color and Morphology of Single Silver Nanospheres 査読有り

      Ichiro Tanabe, Tetsu Tatsuma

      NANO LETTERS12 ( 10 ) 5418 - 5421   2012年10月

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      担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

      Optical control of size, shape, or orientation of a metal nanoparticle is important for development of nanoscale optical devices and elements of photonic circuits. Thus far, however, independent control of two or more parameters has not yet been achieved. Here we place a simple spherical Ag nanoparticle on TiO2 with high refractive index and separate a plasmon mode localized at the Ag-TiO2 interface from the other mode distributed over the nanoparticle. Selective excitation of each mode gives rise to a corresponding morphological change and selective suppression of the plasmon mode, resulting in multicolor changes of scattering light from orange to red, green, or a dark color.

      DOI: 10.1021/nl302919n

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    • Size- and Shape-Controlled Electrochemical Deposition of Metal Nanoparticles by Tapping Mode Atomic Force Microscopy 査読有り

      Ichiro Tanabe, Tetsu Tatsuma

      JOURNAL OF PHYSICAL CHEMISTRY C116 ( 6 ) 3995 - 3999   2012年2月

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      担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

      An electrochemical method for fabrication of metal nanoparticles with controlled size and shape was developed. Ag ions are adsorbed on a conductive substrate, and a voltage is applied between the substrate and a tip of atomic force microscopy in contact mode or tapping mode for deposition of Ag nanoparticles. Although control of particle size is difficult in contact mode because of deterioration in cantilever elasticity, it is possible in tapping mode through regulating the applied voltage or voltage application time. The present method can also be applied to fabrication of Ag nanorods and Ag nanoparticle arrays with controlled size and spacing and deposition of Au nanoparticles.

      DOI: 10.1021/jp2123086

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    • Photoelectrochemical and Optical Behavior of Single Upright Ag Nanoplates on a TiO2 Film 査読有り

      Ichiro Tanabe, Kazuki Matsubara, Nobuyuki Sakai, Tetsu Tatsuma

      JOURNAL OF PHYSICAL CHEMISTRY C115 ( 5 ) 1695 - 1701   2011年2月

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      担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

      Changes in morphology and optical properties of single Ag nanoplates on a nanoparticulate TiO2 film were studied, by means of combined atomic force microscopy and optical dark-field microscopy with the aid of discrete dipole approximation-based spectral simulation. Photocatalytic reduction of Ag+ ions under diffusion-controlled conditions grows hexagonal and triangular Ag nanoplates mostly in vertical orientation. The Ag nanoplates absorb and scatter light at different wavelengths on the basis of three different localized surface plasmon resonance modes, the in-plane longitudinal (IPL), in-plane transverse (IPT), and out-of-plane modes. Typical upright nanoplates scatter orthogonally polarized green and near-infrared (NIR) light on the basis of the IPT and IPL modes, respectively. Sufficient irradiation with visible and/or NIR light topples the standing nanoplates over by photo electrochemical reactions, and typical overturned nanoplates scatter NIR light. Such photoelectrochemical behavior is applied to orientation-selective overturn and polarization-selective control of the optical properties by irradiation with polarized visible or NIR light.

      DOI: 10.1021/jp109715y

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    • Orientation-selective removal of upright Ag nanoplates from a TiO2 film 査読有り

      Yoko Sakai, Ichiro Tanabe, Tetsu Tatsuma

      NANOSCALE3 ( 10 ) 4101 - 4103   2011年

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      Upright Ag nanoplates on a nanoparticulate TiO2 film are oriented on the basis of plasmon-induced charge separation. Polarized visible light removes nanoplates oriented perpendicularly to polarization via excitation of in-plane transverse mode. Polarized near-infrared light removes nanoplates in parallel geometry via excitation of in-plane longitudinal mode.

      DOI: 10.1039/c1nr10762c

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    • Photocatalytic growth and plasmon resonance-assisted photoelectrochemical toppling of upright Ag nanoplates on a nanoparticulate TiO2 film 査読有り

      Ichiro Tanabe, Kazuki Matsubara, Stacey D. Standridge, Emiko Kazuma, K. Lance Kelly, Nobuyuki Sakai, Tetsu Tatsuma

      CHEMICAL COMMUNICATIONS ( 24 ) 3621 - 3623   2009年

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      担当区分:筆頭著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SOC CHEMISTRY  

      Triangular and hexagonal Ag nanoplates deposited on a TiO2 film in a mostly vertical orientation topple under visible light, resulting in a decrease of extinction at the excitation wavelength and increase at longer wavelengths.

      DOI: 10.1039/b904384e

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    • High-quality single crystal growth of Bi-based perovskite ferroelectrics based on defect chemistry 査読有り

      Yuji Noguchi, Ichiro Tanabe, Muneyasu Suzuki, Masaru Miyayama

      JOURNAL OF THE CERAMIC SOCIETY OF JAPAN116 ( 1357 ) 994 - 1001   2008年9月

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      記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI  

      We present the O-2-blowing method for the growth of high-quality single crystals of Bi-based perovskite ferroelectrics, in which O-2 gas is directly introduced inside crucibles during crystal growth. The O-2-blowing method is demonstrated to be effective for enhancing polarization and piezoelectric properties as well as reducing leakage current for (Bi,Na)TiO3-BaTiO3 crystals. The superior properties are suggested to originate from the reduced reorientation of non-180 degrees domains. Ab initio calculations suggest that the interaction between spontaneous polarization and defect dipole composed of Bi vacancy and O vacancy is the origin of the reorientation of non-180 degrees domains. (c) 2008 The Ceramic Society of Japan. All rights reserved.

      DOI: 10.2109/jcersj2.116.994

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    • 電極近傍での溶媒和構造の分光分析 招待有り

      田邉一郎

      ぶんせき2022年 ( 1月号 ) 42 - 43   2022年1月

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      担当区分:筆頭著者, 責任著者  

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    • Spectroscopic analysis focusing on ionic liquid/metal electrode and organic semiconductor interfaces in an electrochemical environment 招待有り 査読有り

      Ichiro Tanabe

      PHYSICAL CHEMISTRY CHEMICAL PHYSICS24 ( 2 ) 615 - 623   2022年1月

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      担当区分:筆頭著者, 責任著者   記述言語:英語   出版者・発行元:ROYAL SOC CHEMISTRY  

      The solid-liquid interface forms an electric double layer that enables the function of electronic devices and, thus, represents an important area of electrochemical research. Because ionic liquids (ILs) are becoming prominent candidates for new high-performing electrolytes, their interface with solid substrates (e.g., metal electrodes or organic semiconductors) attracts substantial attention. An example of improvement achieved using ILs as electrolytes is a decrease in the operating voltage of transistors from >10 V in traditional SiO2-gated transistors to <1 V in IL-gated electronic double-layer organic field-effect devices. This perspective discusses the investigation of poorly accessible IL/substrate interfaces using both attenuated total reflectance ultraviolet (ATR-UV) spectroscopy and a newly developed electrochemical setup combined with ATR-UV (EC-ATR-UV), which allows analysis of the interfacial area under the application of varying electric potential. The recent EC-ATR-UV applications in interfacial analytical chemistry are overviewed and compared to other spectroscopic methods described in the recent literature. Lastly, the supplementation of experimental data with theoretical calculations (e.g., quantum chemical calculations and molecular dynamics simulations) is also addressed.

      DOI: 10.1039/d1cp04094d

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    • ATR-far-ultraviolet spectroscopy in the condensed phase—The present status and future perspectives 査読有り

      Yukihiro Ozaki, Yusuke Morisawa, Ichiro Tanabe, Krzysztof B. Beć

      Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy253   2021年5月15日

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      Far-ultraviolet (FUV) spectroscopy in the region of 140–200 nm of condensed-phase has received keen interest as a new electronic spectroscopy. The introduction of the attenuated total reflection (ATR) technique to the FUV region has opened a new avenue for FUV spectroscopy of liquids and solids. ATR-FUV spectroscopy enables the study of electronic structures and transitions of most types of molecules. It also holds great promise for a variety of applications, i.e., from the application to basic sciences to practical applications. In this review, the characteristics and advantages of ATR-FUV spectroscopy in the condensed phase are described first; then, a brief historical overview is provided. Next, the ATR-FUV spectroscopy instrumentation is outlined. After these introductory parts, a variety of AFT-FUV spectroscopy applications are introduced, starting from applications to investigations of electronic structure and transitions of alkanes, graphenes, and polymers. Then, time-resolved ATR-FUV spectroscopy is discussed. The applications to materials research, such as the research on inorganic semiconductors and ionic liquids, follow. In the last part, the FUV spectroscopy perspective is emphasized.

      DOI: 10.1016/j.saa.2021.119549

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    • 光照射・電気化学環境下で動作する ATR 遠紫外分光法の開発 招待有り 査読有り

      田邉一郎

      分光研究70 ( 1 ) 2 - 11   2021年1月

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      担当区分:筆頭著者, 責任著者  

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    • Advances, challenges and perspectives of quantum chemical approaches in molecular spectroscopy of the condensed phase 査読有り

      Yukihiro Ozaki, Krzysztof B. Beć, Yusuke Morisawa, Shigeki Yamamoto, Ichiro Tanabe, Christian W. Huck, Thomas S. Hofer

      Chemical Society Reviews50 ( 19 ) 10917 - 10954   2021年

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      出版者・発行元:Royal Society of Chemistry (RSC)  

      The purpose of this review is to demonstrate advances, challenges and perspectives of quantum chemical approaches in molecular spectroscopy of the condensed phase.

      DOI: 10.1039/d0cs01602k

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    • Far‐Ultraviolet Spectroscopy in the Solid and Liquid States, Principle, Instrumentation, and Application

      Yusuke Morisawa, Ichiro Tanabe, Yukihiro Ozaki

      Encyclopedia of Analytical Chemistry   1 - 25   2020年11月4日

    • Far- and deep-ultraviolet spectroscopy for inorganic semiconductor materials 招待有り 査読有り

      Ichiro Tanabe

      Molecular and Laser Spectroscopy   245 - 274   2020年

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      担当区分:筆頭著者, 最終著者, 責任著者   出版者・発行元:Elsevier  

      DOI: 10.1016/b978-0-12-818870-5.00007-1

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    • 減衰全反射遠紫外分光法を用いたイオン液体電解液中での金属イオン溶媒和による電子構造解析

      今井雅也, 田邉一郎, 池羽田晶文, 尾崎幸洋, 福井賢一, 福井賢一

      電気化学会大会講演要旨集(CD-ROM)87th   2020年

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    • 機能性材料の遠紫外域における電子励起吸収分光研究 招待有り 査読有り

      田邉一郎

      分析化学69 ( 4-5 ) 197 - 208   2020年

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      担当区分:筆頭著者, 責任著者   記述言語:日本語  

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    • 遠紫外分光法による機能性材料の電子状態研究 招待有り 査読有り

      田邉一郎

      応用物理80 ( 10 ) 646 - 652   2019年10月

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      担当区分:筆頭著者, 責任著者  

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    • Far- and deep-ultraviolet surface plasmon resonance sensors 査読有り

      Ichiro Tanabe, Ken-ichi Fukui

      ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY258   2019年8月

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      記述言語:英語   掲載種別:研究発表ペーパー・要旨(国際会議)   出版者・発行元:AMER CHEMICAL SOC  

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    • Far- and Deep-Ultraviolet Surface Plasmon Resonance Sensor 査読有り

      Ichiro Tanabe, Yoshito Y. Tanaka

      Chemical Record19 ( 7 ) 1210 - 1219   2019年7月

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      担当区分:筆頭著者, 責任著者  

      © 2019 The Chemical Society of Japan & Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Plasmonics in the UV region has been widely focused because of the higher energy and the abundant electronic resonances compared to the conventional visible plasmonics. Recently, we have investigated the surface plasmon resonance (SPR) properties of the Al film, aiming for the application as refractive index sensors. Utilizing the UV lights, we expect three advantages: high sensitivity, material selectivity, and surface selectivity. By using an original attenuated total reflectance spectroscopic instrument, Al-SPR angle and wavelength were investigated with changing environments on the Al film. Al film thickness and materials of prisms on which Al was evaporated were also important factors for the SPR properties. By optimizing the conditions, the Al film worked as a sensor both in air and in liquids. In addition, our established system expands the plasmonics into an even higher energy region than 200 nm, while the UV-plasmonics have been studied in the wavelength region longer than 200 nm.

      DOI: 10.1002/tcr.201800078

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    • Far- and deep-ultraviolet spectroscopy applied for ionic liquids 査読有り

      Ichiro Tanabe

      UV AND HIGHER ENERGY PHOTONICS: FROM MATERIALS TO APPLICATIONS 201911086   2019年

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      記述言語:英語   出版者・発行元:SPIE-INT SOC OPTICAL ENGINEERING  

      Recently, ionic liquids faced on electrodes have been intensively studied because they have been expected as novel electrolytes having high safety and functions. In this study, we constructed an attenuated total reflectance spectroscopic system which worked under electrochemical environments, and investigated electronic states of the ionic liquids near the electrode surface. In accordance with an applied voltage, electronic transition spectra in 150-450 nm range of an ionic liquid consisted of imidazolium cation and iodine anion varied. In particular, absorption due to a charge transfer from the anion to the cation drastically increased at positive potentials. The amount of spectral change and the contact area between the electrode and the ionic liquid were in a positive relationship, and thus, the spectral variations reflected the behavior of the interfacial ionic liquid on the electrode. Time dependence and hysteresis were also discussed. The newly developed system will be applied not only for the ionic liquids but also for various electrochemical materials such as organic semiconductors.

      DOI: 10.1117/12.2528346

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    • Advances in Far-Ultraviolet Spectroscopy in the Solid and Liquid States

      Yusuke Morisawa, Ichiro Tanabe, Yukihiro Ozaki

      Frontiers and Advances in Molecular Spectroscopy   251 - 285   2018年

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      This chapter is concerned with recent advances in far-ultraviolet (FUV) spectroscopy of liquids and solids. In the FUV region not only - and n-π but also Rydberg transitions may be observed. Using an attenuated total reflection (ATR)-FUV spectrometer, one can measure FUV spectra of almost all kinds of solid and liquid samples. The most fundamental advantage of FUV spectroscopy is that it contains unique information about the electronic transitions and structure of molecules. In this chapter principle, advantages, and instrument of FUV spectroscopy for studies of condensed matters are described first, and then ATR-FUV studies of electronic structure of organic molecules, polymers, and water are reported. To interpret their spectra quantum chemical calculations were carried out. Finally, FUV spectroscopy of inorganic semiconductor powders is discussed. ATR-FUV spectroscopy has opened a new avenue for σ chemistry.

      DOI: 10.1016/B978-0-12-811220-5.00007-1

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    • Surface plasmon resonance sensors in far- and deep-ultraviolet regions 査読有り

      Ichiro Tanabe

      Optics InfoBase Conference PapersPart F98-BGPPM 2018   2018年

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      © 2018 The Author(s). Surface plasmon resonance (SPR) in the ultraviolet region attracts much attention due to the higher energy and abundant molecular electronic transitions therein compared to those in the visible region. Herein, we investigated the SPR of aluminum (Al) thin films with varying refractive index of the environment near the films in the far-ultraviolet (FUV, = 200 nm) and deep-ultraviolet (DUV, ≤ 300 nm) regions. By using our original FUV-DUV spectrometer which adopts an attenuated total reflectance (ATR) system, the measurable wavelength range was down to the 180 nm, and the environment near the Al surface could be controlled. Based on the obtained spectra, the dispersion relation of Al-SPR in the FUV and DUV regions was obtained. The FUV-DUV-SPR sensors are expected to have three advantages compared to visible-SPR sensors: higher sensitivity, material selectivity, and surface specificity.

      DOI: 10.1364/BGPPM.2018.JTu2A.51

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    • 遠紫外分光法──新しい電子分光法の誕生とその応用 招待有り

      尾崎幸洋, 田邉一郎, 森澤勇介

      化学72 ( 3 ) 31 - 35   2017年2月

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      記述言語:日本語   掲載種別:記事・総説・解説・論説等(商業誌、新聞、ウェブメディア)  

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    • 遠紫外分光の新しい応用 査読有り

      田邉一郎, 後藤剛喜, 森澤勇介, 尾崎幸洋

      分析化学66 ( 5 ) 319 - 331   2017年

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      担当区分:筆頭著者, 責任著者   記述言語:日本語  

      DOI: 10.2116/bunsekikagaku.66.319

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    • グラファイト電極の電位,電解質イオン種に応じた水溶液電気二重層の局所構造とダイナミクスの分子動力学解析

      今井 雅也, 横田 泰之, 田邉 一郎, 稲垣 耕司, 森川 良忠, 福井 賢一

      表面科学学術講演会要旨集36   71 - 71   2016年

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      記述言語:日本語   出版者・発行元:公益社団法人 日本表面科学会  

      電気化学FM-AFM測定により,電気二重層内の水の構造化が電解質イオンの界面局所濃度と電極電位に大きく依存するという実験結果を受け,本研究では分子動力学(MD)計算を用いて各種電解質の電気化学界面への侵襲性やそれに伴う水のネットワーク構造の変化について評価を行った。電解質イオンの親疎水の程度と電位に応じて水分子の配向変化と密接に関係した局所構造が形成され,水分子の運動性も変化することが明らかとなった。

      DOI: 10.14886/sssj2008.36.0_71

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    • Attenuated Total Reflection Far-Ultraviolet Spectroscopy 査読有り

      Ozaki Yukihiro, Morisawa Yusuke, Goto Takeyoshi, Tanabe Ichiro

      UV and Higher Energy Photonics: From Materials to Applications9926   2016年

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      記述言語:英語  

      DOI: 10.1117/12.2236269

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    • Development of far- and deep-ultraviolet surface plasmon resonance (SPR) sensor using aluminum thin film 査読有り

      Tanabe Ichiro, Tanaka Yoshito Y, Roki Takayuki, Watari Koji, Goto Takeyoshi, Kikawada Masakazu, Inami Wataru, Kawata Yoshimasa, Ozaki Yukihiro

      UV and Higher Energy Photonics: From Materials to Applications9926   2016年

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      記述言語:英語  

      DOI: 10.1117/12.2236259

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    • Far-ultraviolet spectroscopy of solid and liquid states: characteristics, instrumentation, and applications 査読有り

      Ozaki, Yukihiro, Tanabe, Ichiro

      Analyst141 ( 13 ) 3962 - 3981   2016年

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      記述言語:英語   出版者・発行元:Royal Society of Chemistry  

      Recently, far-ultraviolet (FUV) spectroscopy, which is the spectroscopy of wavelengths in the region 140-200 nm, of solid and liquid states has received significant attention as a novel spectroscopic method. FUV spectroscopy provides new possibilities for studying electronic structures and transitions in almost all types of molecules, from water to polymers. It also shows great promise for a variety of applications. It is well known that wavelengths below 200 nm are rich in information regarding the electronic structure and states of molecules. However, absorptivity is so high in the FUV region, that it has not been employed to investigate solids and liquids. Another problem for FUV region analysis was the instrumentation: FUV spectrometers required vacuum evacuation. Moreover, it was difficult to find applications for FUV spectroscopy. Recently, we introduced the attenuated total reflection (ATR) technique to FUV spectroscopy, which overcomes these issues. ATR-FUV spectroscopy enables the measurement of FUV spectra for solid and liquid samples, establishing a new spectroscopic research area. Using ATR-FUV spectroscopy, electronic transitions that cannot be observed with ordinary UV spectroscopy (200-380 nm) are accessible; Rydberg transitions are just one example. FUV spectroscopy has been demonstrated to have unique and versatile applications. A variety of extensive application studies are now in progress, ranging from applications to fundamental science, such as studies of hydrogen bonding, hydration, and adsorption of water and aqueous solutions, to practical applications such as online, geochemical, environmental, and polymer film analyses. This review provides an introduction to, and brief history of, FUV spectroscopy, and describes the development of new FUV spectrometers, studies on electronic structure and transitions, its various applications, and future prospects.

      DOI: 10.1039/c6an00522e

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    • Far-and deep-ultraviolet spectroscopic investigations for titanium dioxide: electronic absorption, Rayleigh scattering, and Raman spectroscopy 査読有り

      Tanabe, Ichiro, Ozaki, Yukihiro

      Journal of Materials Chemistry C4 ( 33 ) 7706 - 7717   2016年

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      担当区分:筆頭著者, 責任著者   記述言語:英語   出版者・発行元:Royal Society of Chemistry  

      Titanium dioxide (TiO2) is a typical semiconductor metal oxide. It functions under irradiation with ultraviolet (UV, &lt;= 400 nm), deep-ultraviolet (DUV, &lt;= 300 nm), and far-ultraviolet (FUV, &lt;= 200 nm) light. Therefore, investigations in these regions are essentially important not only for the basic understanding of the properties of TiO2 but also for the development of various applications such as photocatalysis and solar cells. In this review, the historic and recent research studies of TiO2 in these areas are overviewed. In particular, recent marked progress on attenuated total reflectance (ATR) DUV-FUV spectroscopy, resonant DUV Rayleigh scattering spectroscopy, and DUV Raman spectroscopy are focused on intensively. These pursuits provide detailed insights into the electronic states, bandgap energies, and phase transformations of TiO2 and TiO2 based materials as well as design guides for their applications.

      DOI: 10.1039/c6tc02368a

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    • Electronic structure of TiO2 studied by far-ultraviolet and deep-ultraviolet spectroscopy 査読有り

      Ichiro Tanabe

      Far-and Deep-Ultraviolet Spectroscopy   99 - 121   2015年1月1日

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      記述言語:英語   出版者・発行元:Springer Japan  

      The electronic structure and photocatalytic activities of TiO2 and metalnanoparticle-modified TiO2 were investigated by far-ultraviolet and deep-ultraviolet spectroscopy and photodegradation reaction of methylene blue. First, spectra of naked anatase TiO2 (Sect. 6.2) and metal (Au, Pd, Pt)-nanoparticle-modified TiO2 (Sect. 6.3) were measured. The naked TiO2 spectrum corresponded well with the previously reported reflection spectrum and theoretical calculations. Then, the deposition of metal nanoparticles substantially changed the spectral shape, which indicates changes in the electronic states of TiO2, and the degree of spectral changes strongly depends on the work function of the modified metal. In addition, consistent changes of photocatalytic activities were also observed. Next, two crystalline types of TiO2 (anatase and rutile) were compared (Sect. 6.4), and a larger enhancement of the photocatalytic activity of rutile TiO2 upon Pt nanoparticle deposition was revealed. Subsequently, size effects of modified Au nanoparticle on electronic structures and photocatalytic activities of TiO2 were discussed (Sect. 6.5), and it was made clear that the smaller Au nanoparticle induced the larger electronicstate changes and the higher photocatalytic-activity enhancements. These results demonstrated that the novel far-ultraviolet and deep-ultraviolet spectroscopy is a considerable promising method to investigate the electronic states of materials, leading to the development of high-efficiency optical materials such as photocatalysts and solar cells.

      DOI: 10.1007/978-4-431-55549-0_6

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    • Reply to the comment on "Sensitive marker bands for the detection of spin states of heme in surface-enhanced resonance Raman scattering spectra of metmyoglobin" 査読有り

      Yasutaka Kitahama, Masatoshi Egashira, Toshiaki Suzuki, Ichiro Tanabe, Yukihiro Ozaki

      ANALYST140 ( 17 ) 6147 - 6148   2015年

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      記述言語:英語   出版者・発行元:ROYAL SOC CHEMISTRY  

      In our SERRS spectra of metmyoglobin by excitation at 514 nm, the peak at 1510 cm(-1), which is assigned to the 6-coordinated heme in the low spin state, was observed by the addition of imidazole and NaN3. Thus, the SERRS likely originates not from the non-native 5-coordinated heme, which is in the high spin state.

      DOI: 10.1039/c5an00648a

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    • SOME APPLICATIONS OF PHOTOELECTROCHEMISTRY TO CHEMICAL SENSING

      Tetsu TATSUMA, Kikuo KOMORI, Isao SHITANDA, Nobuyuki SAKAI, Yukina TAKAHASHI, Emiko KAZUMA, Ichiro TANABE, Yuta KISHI

      Chemical Sensors27 ( Supplement A ) 31 - 33   2011年3月

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      記述言語:日本語   出版者・発行元:電気化学会化学センサ研究会  

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    ▼全件表示

    講演・口頭発表等

    • Electrochemical attenuated total reflectance spectroscopy in far- and deep-ultraviolet regions

      I. Tanabe, K. Fukui

      SPIE Annual meeting  2021年8月1日 

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      会議種別:口頭発表(一般)  

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    • 減衰全反射型紫外分光法によるイオン液体/有機半導体界面の電子状態研究

      田邉一郎, 井本彩葉, 岡上大二朗, 今井雅也, 熊谷翔平, 牧田龍幸, 三谷真人, 岡本敏宏, 竹谷純一, 福井賢一

      電気化学会第88回大会  2021年3月22日 

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    • 光照射・電気化学環境下で動作する遠紫外分光法の開発と機能性材料への応用 招待有り

      田邉一郎

      2020年度日本分光学会年次講演会  2020年10月27日 

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    • 電気化学遠紫外分光法の開発~電極界面イオン液体の電子励起スペクトル測定~

      田邉一郎, 今井雅也, 井本彩葉, 福井賢一

      日本化学会第100回春季年会  2020年3月24日 

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    • 遠紫外表面プラズモン共鳴センサーの表面敏感性の検討

      田邉一郎, 清水武蔵, 川端陸斗, 見砂香織, 福井賢一

      第67回応用物理学会春季学術講演会  2020年3月15日 

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    • イオン液体の電子励起吸収分光研究

      田邉一郎, 寿山安紀, 佐藤大輝, 今井雅也, 福井賢一

      第10回イオン液体討論会  2019年11月22日 

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    • SPR Sensing in Far- and Deep-Ultraviolet Regions 招待有り

      I. Tanabe

      IWANN 2019  2019年11月12日 

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    • Plasmon-induced dissociation of acetic acid multimers detected by surface-enhanced near-infrared spectroscopy

      I. Tanabe, F. Watanabe, Y. Hanase, R. Hara, N. Tomosada, T. Genkawa, K. Murayama, Y. Ozaki

      FACSS SciX 2019  2019年10月15日 

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    • Surface plasmon resonance sensors utilizing far- and deep-ultraviolet lights

      I. Tanabe

      FACSS SciX 2019  2019年10月14日 

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    • Electrochemical attenuated total reflectance spectroscopy in far- and deep-ultraviolet regions 招待有り

      I. Tanabe

      FACSS SciX 2019  2019年10月14日 

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    • 電気化学-減衰全反射型遠紫外分光法の開発と電極界面イオン液体の電子励起スペクトル測定

      田邉一郎, 寿山安紀, 佐藤大輝, 今井雅也, 福井賢一

      2019年日本表面真空学会学術講演会  2019年9月30日 

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      会議種別:口頭発表(一般)  

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    • 電極界面におけるイオン液体の電子励起スペクトル測定

      田邉一郎, 寿山安紀, 佐藤大輝, 今井雅也, 福井賢一

      第13回分子化学討論会  2019年9月19日 

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    • 遠紫外光を用いた新規界面分光による界面電解液の電子状態解析

      田邉一郎, 今井雅也, 井本彩葉, 寿山安紀, 福井賢一

      第124回触媒討論会  2019年9月18日 

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      会議種別:口頭発表(一般)  

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    • 機能性材料の遠紫外域における電子励起吸収分光研究 招待有り

      田邉一郎

      日本分析化学会第68年会  2019年9月12日 

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    • Far- and deep-ultraviolet surface plasmon resonance sensors

      I. Tanabe, K. Fukui

      ACS Fall 2019 National Meeting & Exposition  2019年8月25日 

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    • Electrochemical far- and deep-ultraviolet spectroscopy applied for ionic liquids 招待有り

      I. Tanabe

      SPIE Annual meeting  2019年8月11日 

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    • 表面プラズモン共鳴を利用した近赤外増強吸収分光法の開発

      田邉一郎, 花瀬勇貴, 渡邉芙美枝, 友定伸浩, 村山広大, 尾崎幸洋

      平成31年度 日本分光学会年次講演会  2019年5月15日 

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      会議種別:口頭発表(一般)  

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    • 遠紫外分光法の電気化学系への展開 招待有り

      田邉一郎, 福井賢一

      分光イノベーション研究会「分光学夢シンポジウム」  2019年5月15日 

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    • 減衰全反射法を利用した電極界面イオン液体の電子励起スペクトル測定

      田邉一郎, 寿山安紀, 佐藤大輝, 今井雅也, 福井賢一

      日本化学会第99回春季年会  2019年3月16日 

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      会議種別:口頭発表(一般)  

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    • 電気化学環境下におけるイオン液体の電子励起スペクトル

      田邉一郎, 寿山安紀, 佐藤大輝, 今井雅也, 福井賢一

      第66回応用物理学会春季学術講演会  2019年3月11日 

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      会議種別:口頭発表(一般)  

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    • 遠紫外光を利用したプラズモン共鳴センサーの表面敏感性

      田邉一郎, 川端陸斗, 清水武蔵, 福井賢一

      2018年日本表面真空学会学術講演会  2018年11月21日 

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      会議種別:口頭発表(一般)  

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    • Electrochemical far- and deep-ultraviolet spectroscopy applied to ionic liquids

      I. Tanabe, A. Suyama, T. Sato, K. Fukui

      FACSS SciX 2018  2018年10月22日 

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    • Advantages of surface plasmon resonance sensors using far- and deep-ultraviolet regions 招待有り

      I. Tanabe

      FACSS SciX 2018  2018年10月22日 

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    • Far- and deep-ultraviolet spectroscopic investigations of ionic liquids under electrochemical environment 招待有り

      I. Tanabe

      IWANN 2018  2018年10月10日 

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    • 遠紫外プラズモン共鳴センサーの表面敏感性の検討

      田邉一郎, 清水武蔵, 川端陸斗, 福井賢一

      第12回分子化学討論会  2018年9月12日 

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      会議種別:口頭発表(一般)  

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    • Far- and deep-ultraviolet surface plasmon resonance sensor

      I. Tanabe

      ICAMS  2018年6月1日 

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    • Surface Plasmon Resonance Sensors in Far- and Deep-Ultraviolet Regions

      I. Tanabe

      OSA Advanced Photonic Congress: Optical Sensors  2018年6月1日 

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    • 遠紫外表面プラズモン共鳴センサーの表面選択性

      田邉一郎, 清水武蔵, 福井賢一

      平成30年度 日本分光学会年次講演会  2018年5月22日 

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      会議種別:口頭発表(一般)  

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    • 遠紫外域を利用した表面プラズモン共鳴センサー

      田邉一郎, 田中嘉人, 渡利幸治, Taras Hanulia, 後藤剛喜, 居波渉, 川田善正, 尾崎幸洋

      日本化学会第98回年会  2018年3月23日 

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    • 減衰全反射遠紫外分光法を利用したイオン液体の電子励起スペクトル測定と電位依存性

      田邉一郎, 寿山安紀, 佐藤大輝, 福井賢一

      第65回応用物理学会春季学術講演会  2018年3月19日 

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    • 遠紫外-深紫外領域での表面プラズモン共鳴センシングにおける分子の電子励起との相互作用

      田邉一郎, 田中嘉人, 渡利幸治, Taras Hanulia, 後藤剛喜, 居波渉, 川田善正, 尾崎幸洋

      第65回応用物理学会春季学術講演会  2018年3月18日 

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    • 遠紫外域の強みを活かした表面プラズモン共鳴センサーの可能性 招待有り

      田邉一郎

      日本分光学会遠紫外分光部会 第3回講演会「遠/深紫外光と材料物性」  2018年1月26日 

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    • 減衰全反射法を利用した電極界面イオン液体の遠紫外分光研究

      田邉一郎, 寿山安紀, 佐藤大輝, 福井賢一

      第8回イオン液体討論会  2017年11月23日 

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      会議種別:口頭発表(一般)  

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    • Electronic States of Interfacial Ionic Liquids Investigated by Electrochemical Far- and Deep-Ultraviolet Spectroscopy

      I. Tanabe, A. Suyama, T. Sato, K. Fukui

      International;Symposium on;Novel Energy Nanomaterials, Catalysts;Surfaces for Future Earth  2017年10月28日 

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      会議種別:口頭発表(一般)  

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    • Unique property of Al-based far-and deep-ultraviolet SPR sensor 招待有り

      I. Tanabe

      IWANN 2017  2017年10月27日 

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    • Electrochemical far- and deep-ultraviolet spectroscopy applied for interfacial ionic liquids

      I. Tanabe, A. Suyama, T. Sato, K. Fukui

      ISSS-9  2017年10月24日 

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      会議種別:口頭発表(一般)  

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    • Surface plasmon resonance sensors in far- and deep-ultraviolet regions using Al thin films 招待有り

      I. Tanabe

      FACSS SciX 2017  2017年10月9日 

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    • 遠紫外-深紫外分光法による電極界面イオン液体の電子状態研究

      田邉一郎, 寿山安紀, 佐藤大輝, 福井賢一

      第11回分子化学討論会  2017年9月16日 

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      会議種別:口頭発表(一般)  

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    • Electrochemical Attenuated Total Reflectance Far Ultraviolet (EC-ATR-FUV) Spectroscopy Applied for Interfacial Ionic Liquids

      I. Tanabe, A. Suyama, T. Sato, K. Fukui

      PSINAS meeting -Probing Solid-liquid INterfaces at the Atomic Scale-  2017年6月22日 

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      会議種別:口頭発表(一般)  

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    • 減衰全反射紫外分光法による電極界面でのイオン液体の電子状態研究

      田邉一郎, 寿山安紀, 佐藤大輝, 福井賢一

      平成29年度 日本分光学会年次講演会  2017年5月25日 

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      会議種別:口頭発表(一般)  

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    • 遠紫外分光法の機能性材料への展開 招待有り

      田邉一郎

      分光イノベーション研究会「分光学夢シンポジウム」  2017年5月25日 

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    • 減衰全反射型紫外分光法による電極界面イオン液体の電子状態解析

      田邉一郎, 寿山安紀, 福井賢一

      電気化学会第84回大会  2017年3月25日 

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    • 液中におけるアルミニウムの遠紫外-深紫外プラズモン共鳴特性

      田邉一郎, 田中嘉人, 渡利幸治, 後藤剛喜, 居波渉, 川田善正, 尾崎幸洋

      第64回応用物理学会春季学術講演会  2017年3月15日 

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    • 電気化学減衰全反射遠紫外分光測定系による電極と界面を形成するイオン液体の電子状態研究

      田邉一郎, 寿山安紀, 福井賢一

      第64回応用物理学会春季学術講演会  2017年3月14日 

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    • Far- and Deep-Ultraviolet Spectroscopy of Ionic Liquids under Electrochemical Environments

      I. Tanabe, A. Suyama, K. Fukui

      SSSN-Kansai -25th Anniversary of SSSJ Kansai-  2017年1月24日 

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    • 機能性材料への遠紫外分光の応用 招待有り

      田邉一郎

      日本分光学会遠紫外分光部会 第2回講演会「拓かれる紫外・遠紫外分光法の研究領域」  2017年1月7日 

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    • 遠紫外分光と量子化学計算によるイミダゾリウム系イオン液体の電状態研究

      田邉一郎, 藏脇悠司, 森澤勇介, 尾崎幸洋

      第10回分子化学討論会  2016年9月15日 

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    • Development of far- and deep-ultraviolet surface plasmon resonance (SPR) sensor using aluminum thin film 招待有り

      I. Tanabe

      SPIE Annual meeting  2016年8月30日 

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    • 遠紫外分光法と量子化学計算を利用したイオン液体の電状態研究

      田邉一郎, 藏脇悠司, 森澤勇介, 尾崎幸洋

      平成28年度 日本分光学会年次講演会  2016年5月26日 

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    • センサー応用に向けたアルミニウムの遠紫外表面プラズモン特性研究

      田邉一郎, 渡利幸治, 田中嘉人, 領木貴之, 後藤剛喜, 黄川田昌和, 居波渉, 川田善正, 尾崎幸洋

      平成28年度 日本分光学会年次講演会  2016年5月24日 

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    • Electronic Absorption Spectra of Imidazolium-Based Ionic Liquids Studied by Far‒Ultraviolet Spectroscopy and Quantum Chemical Calculation

      I. Tanabe, Y. Ozaki, K. Fukui

      Japan-Finland Research Exchange Meeting  2016年4月28日 

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    • 減衰全反射遠紫外分光と量子化学計算によるイミダゾリウム系イオン液体の電子状態研究

      田邉一郎, 藏脇悠司, 森澤勇介, 尾崎幸洋

      日本化学会第96回年会  2016年3月27日 

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      会議種別:口頭発表(一般)  

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    • アルミニウムの遠紫外表面プラズモン特性の屈折率依存性

      田邉一郎, 田中嘉人, 領木貴之, 渡利幸治, 後藤剛喜, 黄川田昌和, 居波渉, 川田善正, 尾崎幸洋

      第63回応用物理学会春季学術講演会  2016年3月20日 

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    • センサー応用に向けたアルミニウム薄膜の遠紫外表面プラズモン特性の屈折率依存性研究

      田邉一郎, 田中嘉人, 領木貴之, 渡利幸治, 後藤剛喜, 黄川田昌和, 居波渉, 川田善正, 尾崎幸洋

      第13回プラズモニクスシンポジウム  2016年1月22日 

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    • Imaging of time-dependent changes of hydrophilicity and its inhomogeneity on a titanium dioxide film induced by UV irradiations studied by the newly developed NIR Camera (Compovision)

      I. Tanabe, D. Ishikawa, D. Furukawa, M. Ishigaki, T. Goto, T. Morishima, T. Okuno, Y. Ozaki

      Pacifichem 2015  2015年12月18日 

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    • Electronic states and photocatalytic activities of titanium dioxide with metal (Au, Pd, Pt) nanoparticles studied by far-ultraviolet spectroscopy

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