Updated on 2025/06/27

写真b

 
MITSUI Masaaki
 
*Items subject to periodic update by Rikkyo University (The rest are reprinted from information registered on researchmap.)
Affiliation*
College of Science Department of Chemistry
Graduate School of Science Doctoral Program in Chemistry
Graduate School of Science Master's Program in Chemistry
Title*
Professor
Degree
博士(理学) ( 京都大学 )
Contact information
Mail Address
Research Interests
  • 光物理化学

  • 励起状態・励起子

  • 多重極子発色団

  • 配位子保護金属クラスター

  • 単一分子分光

  • 三重項-三重項消滅フォトンアップコンバージョン

  • 色素増感太陽電池

  • Campus Career*
    • 4 2014 - Present 
      College of Science   Department of Chemistry   Professor
    • 4 2014 - Present 
      Graduate School of Science   Master's Program in Chemistry   Professor
    • 4 2014 - Present 
      Graduate School of Science   Doctoral Program in Chemistry   Professor
     

    Research Areas

    • Nanotechnology/Materials / Fundamental physical chemistry  / 光物理化学

    • Nanotechnology/Materials / Functional solid state chemistry  / 光エネルギー変換

    • Nanotechnology/Materials / Nanometer-scale chemistry  / ナノ物質・クラスター

    • Nanotechnology/Materials / Functional solid state chemistry  / フォトン・アップコンバージョン

    Research History

    • 4 2014 - Present 
      RIKKYO UNIVERSITY   Graduate School of Science Field of Study: Chemistry   Professor

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    • 4 2014 - Present 
      RIKKYO UNIVERSITY   College of Science Department of Chemistry   Professor

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    • 4 2013 - 3 2014 
      Shizuoka University   Graduate School of Science

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    • 10 2007 - 3 2013 
      Shizuoka University   Faculty of Science

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    • 4 2010 - 9 2010 
      Tokyo Institute of Technology

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    • 4 2006 - 9 2007 
      Keio University   Faculty of Science and Technology

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    • 4 2002 - 3 2006 
      Keio University   Faculty of Science and Technology

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    • 8 2000 - 3 2002 
      Keio University   Faculty of Science and Technology

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    • 4 2000 - 7 2000 
      Kyoto University   Faculty of Science

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    • 4 1997 - 3 2000 
      日本学術振興会特別研究員   (DC1)

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    Education

    • 7 2000 
      Kyoto University

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    • 4 1997 - 3 2000 
      Kyoto University   Graduate School of Science   Division of Chemistry

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      Country: Japan

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    • 4 1995 - 3 1997 
      Tokyo Institute of Technology   Graduate School of Science and Engineering

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      Country: Japan

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    • 4 1991 - 3 1995 
      Tokyo Institute of Technology   School of Science

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      Country: Japan

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    Committee Memberships

    • 4 2024 - Present 
      文部科学省   科学技術・科学技術動向研究センター専門調査員

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    • 9 2022 - Present 
      分子科学会   運営委員会 監査

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      Committee type:Academic society

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    • 4 2023 - 3 2024 
      文部科学省   科学技術・科学技術動向研究センター専門調査員

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    • 4 2022 - 3 2023 
      文部科学省   科学技術・科学技術動向研究センター専門調査員

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    • 4 2021 - 3 2022 
      文部科学省   科学技術・科学技術動向研究センター専門調査員

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    • 8 2021 - 9 2021 
      分子科学会   第15回分子科学討論会・優秀講演賞代表選考委員

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      Committee type:Academic society

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    • 4 2020 - 3 2021 
      文部科学省   科学技術・科学技術動向研究センター専門調査員

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    • 4 2019 - 3 2020 
      文部科学省   科学技術・科学技術動向研究センター専門調査員

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    • 8 2019 - 9 2019 
      分子科学会   第13回分子科学討論会・優秀講演賞代表選考委員

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      Committee type:Academic society

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    • 4 2018 - 3 2019 
      文部科学省   科学技術・科学技術動向研究センター専門調査員

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    • 4 2017 - 3 2018 
      文部科学省   科学技術・科学技術動向研究センター専門調査員

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    • 4 2016 - 3 2017 
      文部科学省   科学技術・科学技術動向研究センター専門調査員

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    • 2017 
      日本学術振興会   卓越研究員候補者選考員会書面審査員

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    • 4 2013 - 3 2015 
      分子科学会   企画委員会委員

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      Committee type:Academic society

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    • 2013 - 2014 
      日本学術振興会   科学研究費審査委員 第1段階審査(書面審査)委員

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    • 4 2010 - 3 2012 
      日本化学会   東海支部代議員

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      Committee type:Academic society

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    • 4 2006 - 3 2008 
      ナノ学会   編集委員

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      Committee type:Academic society

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    •  
      独立行政法人日本学術振興会   特別研究員等審査会専門委員/国際事業委員会書面審査委員・書面評価委員

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    Awards

    • 10 2024  
      分子科学会  第18回分子科学討論会 分子科学会優秀ポスター賞  配位子最適化によるAg15Cu12クラスターの近赤外発光と三重項増感特性の飛躍的向上
       
      有馬大地, 三井

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    • 9 2024  
      Molecular Science  International Investigator Awards of the Japan Society for Molecular Science 

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    • 5 2024  
      ナノ学会  第22回大会ナノ学会 若手優秀ポスター発表賞  異原子ドーピングによるAu25 超原子分子の近赤外光増感特性チューニング
       
      有馬大地, 三井

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    • 10 2023  
      分子科学会  第17回分子科学討論会 分子科学会優秀講演賞  配位子保護Au2Cu6クラスターにおける熱活性化遅延蛍光の誘起とその機構解明
       
      有馬大地, 三井

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    • 9 2023  
      Poster Award  Near-infrared-to-Visible Photon Upconversion Using Ligand-Protected Alloy Nanocluster Sensitizers

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    • 5 2023  
      ナノ学会  第21回大会ナノ学会 若手優秀ポスター発表賞  配位子保護PtAg28クラスター三重項増感剤による低閾値励起強度での高効率フォトンアップコンバージョン
       
      内田惇木, 三井

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    • 5 2023  
      ナノ学会  第21回大会ナノ学会 若手優秀ポスター発表賞  配位子保護Au2Cu6クラスターの蛍光・燐光・遅延蛍光の競合に対する配位子効果
       
      有馬大地, 三井

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    • 10 2022  
      光化学協会  2022年光化学討論会 優秀学生発表賞(ポスター)  発光体配位子保護 Au-Cu 合金クラスターを増感剤に用いた高効率フォトンアップコンバージョン
       
      有馬大地,三井

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    • 5 2022  
      ナノ学会  第20回大会ナノ学会 若手優秀ポスター発表賞  「配位子保護Au-Cu合金クラスターにおける励起状態緩和の全容解明 - 光アップコンバージョン解析によるアプローチ -」
       
      有馬大地, 三井

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    • 9 2021  
      分子科学会  第15回分子科学討論会 分子科学会優秀ポスター賞  配位子保護金クラスターを三重項増感剤に用いた光アップコンバージョン
       
      和田悠幹, 三井

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    • 9 2019  
      分子科学会  分子科学会優秀講演賞  発光解析に基づく配位子保護金属クラスターの平衡状態評価法の確立
       
      新堀佳紀, 三井

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    • 11 2016  
      第35回 固体・表面光化学討論会  ポスター賞  CH3NH3PbI3を基盤としたヘテロ層構造の発光顕微分光
       
      齋藤祐太, 三井

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    • 11 2016  
      第35回 固体・表面光化学討論会  ポスター賞  D-π-A-π-D四重極子色素の単一分子分光 : 発光特性に対する固体環境効果
       
      水上俊成, 三井

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    • 3 2006  
      日本化学会  日本化学会進歩賞  巨大な分子クラスターの生成法の開発とその電子構造の解明
       
      三井正明

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      Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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    • 9 2005  
      分子構造総合討論会  分子構造総合討論会奨励賞  分子クラスターにおける固体-液体類似相の共存
       
      三井正明

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      Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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    Papers

    • Recent Advances in Understanding Triplet States in Metal Nanoclusters: Their Formation, Energy Transfer, and Applications in Photon Upconversion. International journal

      Masaaki Mitsui

      The journal of physical chemistry letters15 ( 50 ) 12257 - 12268   19 12 2024

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      Language:English   Publishing type:Research paper (scientific journal)  

      Recent experimental findings, rapidly accumulating over the past few years, has revealed that in the electronic excited states of metal nanoclusters (MNCs) composed of noble metal atoms (e.g., Cu, Ag, or Au), triplet states are generated with remarkably high efficiency, exerting a pivotal influence over the photophysical properties of the MNCs, notably their photoluminescence characteristics. As a result, MNCs are increasingly recognized as promising luminescent nanomaterials that exhibit room-temperature phosphorescence and thermally activated delayed fluorescence. Furthermore, the significance of triplet-state-mediated energy transfer and charge transfer in intermolecular photophysical processes is gaining increasing recognition, particularly in the applications of MNCs as photosensitizers for singlet oxygen and organic molecular triplets. This Perspective focuses on recent advances in understanding of the formation and photophysics of triplet states in MNCs. Additionally, a brief overview is provided of a series of studies exploring the use of MNCs as triplet sensitizers for photon upconversion via triplet-triplet annihilation, and future prospects for this emerging application are discussed.

      DOI: 10.1021/acs.jpclett.4c03003

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    • Geometric and Electronic Properties of P Atom-Doped Al Nanoclusters: Alkaline-like Superatom of P@Al<sub>12</sub>

      Minoru Akutsu, Kiichirou Koyasu, Ken Miyajima, Masaaki Mitsui, Tomoya Inoue, Atsushi Nakajima

      The Journal of Physical Chemistry A128 ( 32 ) 6648 - 6657   31 7 2024

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      Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

      DOI: 10.1021/acs.jpca.4c02786

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    • Triplet-Mediator Ligand-Protected Metal Nanocluster Sensitizers for Photon Upconversion

      Daichi Arima, Shion Hidaka, So Yokomori, Yoshiki Niihori, Yuichi Negishi, Ryuichi Oyaizu, Takumi Yoshinami, Kenji Kobayashi, Masaaki Mitsui

      Journal of the American Chemical Society   13 5 2024

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      Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

      DOI: 10.1021/jacs.4c03635

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    • Triplet properties and intersystem crossing mechanism of PtAg28 nanocluster sensitizers achieving low threshold and efficient photon upconversion. International journal

      Masaaki Mitsui, Atsuki Uchida

      Nanoscale   19 1 2024

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      Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

      Ligand-protected metal nanoclusters have emerged as a promising platform for providing sensitizers for triplet-triplet annihilation upconversion (TTA-UC). Herein, we report [PtAg28(BDT)12]4- (PtAg28; BDT = 1,3-benzenedithiolate) as a sensitizer enabling TTA-UC at low excitation intensities. PtAg28 exhibits a long-lived triplet state (approximately 7 μs) generated with a 100% intersystem crossing (ISC) quantum yield. The mechanism driving this efficient ISC was unveiled with the aid of theoretical calculations. Specifically, the S1-T1 ISC reveals a small spin-orbit coupling (SOC) matrix element, attributed to their similar electron configuration. In contrast, the T2 state, which is energetically close to S1, features a hole distribution derived from the Py superatomic orbital of the icosahedral Pt@Ag12 core. This distribution enables direct SOC based on the orbital angular momentum change from the S1 state with a Pz-derived hole distribution. Consequently, the efficient ISC was rationalized by the S1 → T2 → T1 pathway. The T1 state possesses a metal core-to-surface metal charge transfer character, facilitating triplet energy transfer and conferring superior sensitization ability. Leveraging these characteristics, the combination of PtAg28 sensitizer with a 9,10-diphenylanthracene annihilator/emitter attained an extremely low UC threshold of 0.81 mW cm-2 at 532 nm excitation, along with efficient green-to-blue TTA-UC with an internal quantum yield (ΦUCg) of 12.2% (50% maximum). This results in a pseudo-first-order TTA process with strong UC emission under 1-sun conditions.

      DOI: 10.1039/d3nr05992h

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    • Tailoring sensitization properties and improving near-infrared photon upconversion performance through alloying in superatomic molecular Au<sub>25</sub> nanoclusters Invited Peer-reviewed

      Masaaki Mitsui, Yuki Miyoshi, Daichi Arima

      Nanoscale16 ( 31 ) 14757 - 14765   2024

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      Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

      The alloying of rod-shaped Au<sub>25</sub> nanoclusters with Cu atoms significantly enhanced the triplet sensitization and near-infrared photon upconversion properties when paired with 9,10-bis(phenylethynyl)anthracene annihilators.

      DOI: 10.1039/d4nr01948b

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    • Dissecting the Triplet-State Properties and Intersystem Crossing Mechanism of the Ligand-Protected Au<sub>13</sub> Superatom

      Kouta Yoshida, Daichi Arima, Masaaki Mitsui

      The Journal of Physical Chemistry Letters   10967 - 10973   1 12 2023

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      Authorship:Corresponding author   Publishing type:Research paper (scientific journal)   Publisher:American Chemical Society (ACS)  

      DOI: 10.1021/acs.jpclett.3c02977

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    • Nested Keplerian architecture of [Cu<sub>58</sub>H<sub>20</sub>(SPr)<sub>36</sub>(PPh<sub>3</sub>)<sub>8</sub>]<sup>2+</sup> nanoclusters Peer-reviewed

      Sourav Biswas, Sakiat Hossian, Taiga Kosaka, Jin Sakai, Daichi Arima, Yoshiki Niihori, Masaaki Mitsui, De-en Jiang, Saikat Das, Song Wang, Yuichi Negishi

      Chemical Communications59 ( 61 ) 9336 - 9339   2023

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      Publishing type:Research paper (scientific journal)   Publisher:Royal Society of Chemistry (RSC)  

      The composition of the structure consists of a series of five concentric polyhedra comprising Cu(i) atoms, along with an additional set of five concentric polyhedra composed of ligands spanning a distance of 2 nm.

      DOI: 10.1039/d3cc01811c

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    • Structurally Flexible Au-Cu Alloy Nanoclusters Enabling Efficient Triplet Sensitization and Photon Upconversion Peer-reviewed

      Masaaki Mitsui

      Journal of the American Chemical Society   2023

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      Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

      DOI: 10.1021/JACS.3C00870

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    • Charge-Transfer-Mediated Mechanism Dominates Oxygen Quenching of Ligand-Protected Noble-Metal Cluster Photoluminescence Peer-reviewed

      Masaaki Mitsui

      Journal of Physical Chemistry Letters13   9272 - 9278   9 2022

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      Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)  

      DOI: 10.1021/ACS.JPCLETT.2C02568

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    • On the Origin of Photoluminescence Enhancement in Biicosahedral AgxAu25-x Nanoclusters (x=0-13) and Their Application to Triplet-Triplet Annihilation Photon Upconversion Peer-reviewed

      Masaaki Mitsui, Daichi Arima, Yuki Kobayashi, Eunji Lee, Yoshiki Niihori

      ADVANCED OPTICAL MATERIALS   7 2022

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      Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

      DOI: 10.1002/adom.202200864

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    • Evidence for triplet-state-dominated luminescence in biicosahedral superatomic molecular Au-25 clusters Peer-reviewed

      Masaaki Mitsui, Yuki Wada, Ryoto Kishii, Daichi Arima, Yoshiki Niihori

      NANOSCALE14 ( 22 )   6 2022

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      Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

      DOI: 10.1039/d2nr00813k

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    • Unravelling the origin of dual photoluminescence in Au<sub>2</sub>Cu<sub>6</sub> clusters by triplet sensitization and photon upconversion Invited Peer-reviewed

      Masaaki Mitsui

      Journal of Materials Chemistry C10 ( 12 ) 4597 - 4606   2022

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      Authorship:Corresponding author   Publishing type:Research paper (scientific journal)  

      DOI: 10.1039/D1TC04591A

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    • Excited-State Symmetry Breaking in a Multiple Multipolar Chromophore Probed by Single-Molecule Fluorescence Imaging and Spectroscopy Peer-reviewed

      Masaaki Mitsui, Yasushi Takakura, Kazuya Hirata, Yoshiki Niihori, Yutaka Fujiwara, Kenji Kobayashi

      JOURNAL OF PHYSICAL CHEMISTRY B125 ( 35 ) 9950 - 9959   9 2021

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      Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

      DOI: 10.1021/acs.jpcb.1c04915

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    • Starburst-Shaped D-pi-A Chromophores Possessing a Hexaethynylbenzene Core for Dye-Sensitized Solar Cells Peer-reviewed

      Masaaki Mitsui, Yushiro Nakagome, Yoshiki Niihori, Shota Inoue, Yutaka Fujiwara, Kenji Kobayashi

      ACS APPLIED MATERIALS & INTERFACES13 ( 30 ) 35739 - 35749   8 2021

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      Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

      DOI: 10.1021/acsami.1c08431

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    • Single Platinum Atom Doping to Silver Clusters Enables Near-Infrared-to-Blue Photon Upconversion Peer-reviewed

      Yoshiki Niihori, Yuki Wada, Masaaki Mitsui

      ANGEWANDTE CHEMIE-INTERNATIONAL EDITION60 ( 6 ) 2822 - 2827   2 2021

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      Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

      DOI: 10.1002/anie.202013725

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    • Synthesis and Properties of a Cyclohexa-2,7-anthrylene Ethynylene Derivative Peer-reviewed

      Masaaki Mitsui

      Angewandte Chemie International Edition60 ( 2 ) 998 - 1003   11 1 2021

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      Authorship:Corresponding author   Publishing type:Research paper (scientific journal)  

      DOI: 10.1002/ANIE.202012120

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      Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/anie.202012120

    • Synthesis and Properties of a Cyclohexa‐2,7‐anthrylene Ethynylene Derivative

      Hironori Matsuki, Keisuke Okubo, Yuta Takaki, Yoshiki Niihori, Masaaki Mitsui, Eiichi Kayahara, Shigeru Yamago, Kenji Kobayashi

      Angewandte Chemie133 ( 2 ) 1011 - 1016   3 11 2020

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      Publisher:Wiley  

      <jats:title>Abstract</jats:title><jats:p>The synthesis of a cyclohexa‐2,7‐(4,5‐diaryl)anthrylene ethynylene (<jats:bold>1</jats:bold>) was achieved for the first time by using 1,8‐diaryl‐3,6‐diborylanthracene and 1,8‐diaryl‐3,6‐diiodoanthracene as key synthetic intermediates. Macrocycle <jats:bold>1</jats:bold> possesses a planar conformation of approximately <jats:italic>D</jats:italic><jats:sub>6<jats:italic>h</jats:italic></jats:sub> symmetry, because of the triple‐bond linker between the anthracene units at the 2,7‐positions. It was confirmed that macrocycle <jats:bold>1</jats:bold>, bearing bulky substituents at the outer peripheral positions, behaves as a monomeric form in solution without π‐stacking self‐association. Macrocycle <jats:bold>1</jats:bold> has an inner‐cavity size that allows specific inclusion of [9]cycloparaphenylene ([9]CPP), but not [8]CPP or [10]CPP, through an aromatic edge‐to‐face CH‐π interaction.</jats:p>

      DOI: 10.1002/ange.202012120

      DOI: 10.1002/chem.202203462_references_DOI_SXtoafInqazD6zZ8vYjt6VYRsjT

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      Other Link: https://onlinelibrary.wiley.com/doi/full-xml/10.1002/ange.202012120

    • Quantification of Dyes Generating Photocurrent and/or Photoluminescence in Dye-Sensitized Solar Cells Using Laser Scanning Microscopy Invited Peer-reviewed

      Masaaki Mitsui, Kyosuke Mori, Reina Kobayashi

      ENERGIES13 ( 8 )   4 2020

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      Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

      DOI: 10.3390/en13081866

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    • Photophysical and Thermodynamic Properties of Ag-29(BDT)(12)(TPP)(x) (x=0-4) Clusters in Secondary Ligand Binding-Dissociation Equilibria Unraveled by Photoluminescence Analysis Peer-reviewed

      Yoshiki Niihori, Naoya Takahashi, Masaaki Mitsui

      JOURNAL OF PHYSICAL CHEMISTRY C124 ( 10 ) 5880 - 5886   3 2020

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      Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

      DOI: 10.1021/acs.jpcc.9b11928

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    • Excited-State Symmetry Breaking of a Symmetrical Donor–π–Donor Quadrupolar Molecule at a Polymer/Glass Interface. Peer-reviewed

      M. Mitsui, Y. Takakura, Y. Niihori, M. Nakamoto, Y. Fujiwara, K. Kobayashi

      J. Phys. Chem. C123 ( 23 ) 14564 - 14572   6 2019

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      Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

      DOI: 10.1021/acs.jpcc.9b03612

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    • Impacts of Environmental Rigidity on Photophysical Characteristics and Behaviors of a Quadrupolar Chromophore Revealed by Single-Molecule Fluorescence Spectroscopy Peer-reviewed

      T. Mizukami, S. Inoue, H. Ohsawa, Y. Niihori, K. Kobayashi, M. Mitsui

      J. Phys. Chem. C122 ( 37 ) 21295 - 21307   2018

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      Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

      DOI: 10.1021/acs.jpcc.8b03889

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    • Geometric and electronic properties of Si-atom doped Al clusters: robustness of binary superatoms against charging Peer-reviewed

      Minoru Akutsu, Kiichirou Koyasu, Junko Atobe, Ken Miyajima, Masaaki Mitsui, Hironori Tsunoyama, Atsushi Nakajima

      PHYSICAL CHEMISTRY CHEMICAL PHYSICS19 ( 31 ) 20401 - 20411   8 2017

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      Language:English   Publishing type:Research paper (scientific journal)  

      DOI: 10.1039/c7cp03409a

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    • Methodology for Discriminating between Competitive Photophysical Processes in Photoblinking: Application to the Fluorescence Blinking of Single Dye Molecules Adsorbed on TiO2 Peer-reviewed

      Masaaki Mitsui, Aki Unno, Kyosuke Mori

      CHEMISTRY LETTERS46 ( 6 ) 866 - 869   6 2017

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      Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

      DOI: 10.1246/cl.170127

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    • Electronic spectra and excited-state dynamics of acridine and its hydrated clusters Peer-reviewed

      Colin Harthcock, Jie Zhang, Wei Kong, Masaaki Mitsui, Yasuhiro Ohshima

      JOURNAL OF CHEMICAL PHYSICS146 ( 13 ) 134311   4 2017

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      Language:English   Publishing type:Research paper (scientific journal)  

      DOI: 10.1063/1.4979631

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    • Single-Molecule Fluorescence Spectroscopy of Perylene Diimide Dyes in a gamma-Cyclodextrin Film: Manifestation of Photoinduced H-Atom Transfer via Higher Triplet (n, pi*) Excited States Peer-reviewed

      Masaaki Mitsui, Hiroki Fukui, Ryoya Takahashi, Yasushi Takakura, Toshinari Mizukami

      JOURNAL OF PHYSICAL CHEMISTRY A121 ( 8 ) 1578 - 1587   3 2017

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      DOI: 10.1021/acs.jpca.6b11353

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    • Synthesis and Self-Assembly of Cyclic 2,7-Anthrylene Ethynylene 1,3-Phenylene Ethynylene Trimer with a Planar Conformation Peer-reviewed

      Yuta Takaki, Ryota Ozawa, Takashi Kajitani, Takanori Fukushima, Masaaki Mitsui, Kenji Kobayashi

      CHEMISTRY-A EUROPEAN JOURNAL22 ( 47 ) 16759 - 16763   11 2016

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      DOI: 10.1002/chem.201603627

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    • Effects of Supramolecular Encapsulation on Photophysics and Photostability of a 9,10-Bis(arylethynyl)anthracene-Based Chromophore Revealed by Single-Molecule Fluorescence Spectroscopy Peer-reviewed

      Masaaki Mitsui, Koji Higashi, Yohei Hirumi, Kenji Kobayashi

      JOURNAL OF PHYSICAL CHEMISTRY A120 ( 42 ) 8317 - 8325   10 2016

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      DOI: 10.1021/acs.jpca.6b08734

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    • Understanding Photoinduced Charge Transfer Dynamics of Single Perylenediimide Dyes in a Polymer Matrix by Bin-Time Dependence of their Fluorescence Blinking Statistics Peer-reviewed

      Masaaki Mitsui, Aki Unno, Syun Azechi

      JOURNAL OF PHYSICAL CHEMISTRY C120 ( 28 ) 15070 - 15081   7 2016

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      DOI: 10.1021/acs.jpcc.6b04114

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    • Correlations between Photovoltaic Characteristics, Adsorption Number, and Regeneration Kinetics in Dye-Sensitized Solar Cells Revealed by Scanning Photocurrent Microscopy Peer-reviewed

      Masaaki Mitsui, Yuya Kawano, Kyosuke Mori, Naoto Wakabayashi

      LANGMUIR31 ( 25 ) 7158 - 7165   6 2015

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      DOI: 10.1021/acs.langmuir.5b01581

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    • Formation and Electronic Structures of Organoeuropium Sandwich Nanowires Peer-reviewed

      Natsuki Hosoya, Ryuta Takegami, Jun-ichi Suzumura, Keizo Yada, Ken Miyajima, Masaaki Mitsui, Mark B. Knickelbein, Satoshi Yabushita, Atsushi Nakajima

      JOURNAL OF PHYSICAL CHEMISTRY A118 ( 37 ) 8298 - 8308   9 2014

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      DOI: 10.1021/jp5011007

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    • Encapsulation with the Protrusion of Cruciform 9,10Bis( arylethynyl) anthracene Derivatives in a Self- Assembled Boronic Ester Cavitand Capsule: Photochemical and Photophysical Properties Peer-reviewed

      Yohei Hirumi, Kento Tamaki, Tomotaka Namikawa, Kenji Kamada, Masaaki Mitsui, Kengo Suzuki, Kenji Kobayashi

      CHEMISTRY-AN ASIAN JOURNAL9 ( 5 ) 1282 - 1290   5 2014

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      DOI: 10.1002/asia.201400042

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    • Enhanced photostability of an anthracene-based dye due to supramolecular encapsulation: a new type of photostable fluorophore for single-molecule study Peer-reviewed

      Masaaki Mitsui, Koji Higashi, Ryoya Takahashi, Yohei Hirumi, Kenji Kobayashi

      PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES13 ( 8 ) 1130 - 1136   2014

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      DOI: 10.1039/c4pp00065j

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    • Electronic energy transfer in tetracene-doped p-terphenyl nanoparticles: Extraordinarily high fluorescence enhancement and quenching efficiency Peer-reviewed

      Masaaki Mitsui, Yuya Kawano

      CHEMICAL PHYSICS419   30 - 36   6 2013

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      DOI: 10.1016/j.chemphys.2013.01.004

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    • Photophysics and photostability of 9,10-bis(phenylethynyl)anthracene revealed by single-molecule spectroscopy Peer-reviewed

      Masaaki Mitsui, Yuya Kawano, Ryoya Takahashi, Hiroki Fukui

      RSC ADVANCES2 ( 26 ) 9921 - 9931   2012

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      DOI: 10.1039/c2ra21100a

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    • Development of a;simple sample holder for variable-temperature single-molecule fluorescence spectroscopy Peer-reviewed

      J. Spec;Soc. Jpn60 ( 4 ) 133 - 134   2011

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    • Characterization of alkyl monolayer covalently bonded to Si(111) and soft-landing of vanadium-benzene sandwich clusters onto the alkyl monolayer substrate Peer-reviewed

      T. Matsumoto, S. Nagaoka, K. Ikemoto, M. Mitsui, M. Ara, H. Tada, A. Nakajima

      EUROPEAN PHYSICAL JOURNAL D52 ( 1-3 ) 99 - 102   4 2009

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      DOI: 10.1140/epjd/e2009-00069-9

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    • An atomic force microscope study of vanadium-benzene sandwich clusters soft-landed on self-assembled monolayers Peer-reviewed

      S. Nagaoka, K. Ikemoto, K. Fujio, K. Hiehata, A. Sasahara, M. Mitsui, H. Onishi, A. Nakajima

      EUROPEAN PHYSICAL JOURNAL D52 ( 1-3 ) 103 - 106   4 2009

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      DOI: 10.1140/epjd/e2009-00068-x

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    • Soft-Landing Experiments of Cr(benzene)(2) Sandwich Complexes onto a Carboxyl-Terminated Self-Assembled Monolayer Matrix Peer-reviewed

      Kaori Ikemoto, Shuhei Nagaoka, Takeshi Matsumoto, Masaaki Mitsui, Atsushi Nakajima

      JOURNAL OF PHYSICAL CHEMISTRY C113 ( 11 ) 4476 - 4482   3 2009

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      DOI: 10.1021/jp807137p

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    • Soft-landing isolation of gas-phase-synthesized transition metal-benzene complexes into a fluorinated self-assembled monolayer matrix Peer-reviewed

      Shuhei Nagaoka, Kaori Ikemoto, Takeshi Matsumoto, Masaaki Mitsui, Atsushi Nakajima

      JOURNAL OF PHYSICAL CHEMISTRY C112 ( 40 ) 15824 - 15831   10 2008

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      DOI: 10.1021/jp8055784

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    • Mass spectroscopic study of metal-rich K2-5(KI)(n)(+) nanoclusters Peer-reviewed

      S. H. Huh, H. S. Jeong, K. Koyasu, K. Miyajima, M. Mitsui, A. Nakajima

      JOURNAL OF MOLECULAR STRUCTURE886 ( 1-3 ) 39 - 42   8 2008

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      DOI: 10.1016/j.molstruc.2007.02.011

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    • Mass spectrometry and photoelectron spectroscopy of o-, m-, and p-terphenyl cluster anions: The effect of molecular shape on molecular assembly and ion core character Peer-reviewed

      Masaaki Mitsui, Naoto Ando, Atsushi Nakajima

      JOURNAL OF PHYSICAL CHEMISTRY A112 ( 25 ) 5628 - 5635   6 2008

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      DOI: 10.1021/jp801159n

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    • Thermal and hyperthermal collision-energy depositions of transition metal-benzene sandwich complexes onto a self-assembled n-octadecanethiol monolayer Peer-reviewed

      Shuhei Nagaoka, Kaori Ikemoto, Takeshi Matsumoto, Masaaki Mitsui, Atsushi Nakajima

      JOURNAL OF PHYSICAL CHEMISTRY C112 ( 17 ) 6891 - 6899   5 2008

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      DOI: 10.1021/jp711695s

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    • Photoelectron spectroscopy of cluster anions of naphthalene and related aromatic hydrocarbons Peer-reviewed

      Naoto Ando, Masaaki Mitsui, Atsushi Nakajima

      JOURNAL OF CHEMICAL PHYSICS128 ( 15 ) 154318-1 - 154318-8   4 2008

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      DOI: 10.1063/1.2903473

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    • Comprehensive photoelectron spectroscopic study of anionic clusters of anthracene and its alkyl derivatives: Electronic structures bridging molecules to bulk Peer-reviewed

      Naoto Ando, Masaaki Mitsui, Atsushi Nakajima

      JOURNAL OF CHEMICAL PHYSICS127 ( 23 ) 234305-13   12 2007

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      DOI: 10.1063/1.2805185

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    • Mass spectrometry and photoelectron spectroscopy of tetracene cluster anions, (Tetracene)(n)(-) (n=1-100): Evidence for the highly localized nature of polarization in a cluster analogue of oligoacene crystals Peer-reviewed

      Masaaki Mitsui, Naoto Ando, Atsushi Nakajima

      JOURNAL OF PHYSICAL CHEMISTRY A111 ( 39 ) 9644 - 9648   10 2007

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      DOI: 10.1021/jp076134h

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    • Fabrication and characterization of a granular film consisting of size-selected silver nanoparticles: application to a SERS substrate Peer-reviewed

      S. Kawabata, N. Ishikawa, M. Mitsui, A. Nakajima

      EUROPEAN PHYSICAL JOURNAL D43 ( 1-3 ) 155 - 158   7 2007

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      DOI: 10.1140/epjd/e2007-00064-2

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    • Formation of large molecular cluster anions and elucidation of their electronic structures Invited Peer-reviewed

      Masaaki Mitsui, Atsushi Nakajima

      BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN80 ( 6 ) 1058 - 1074   6 2007

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      DOI: 10.1246/bcsj.80.1058

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    • Soft-landing isolation of multidecker V-2(benzene)(3) complexes in an organic monolayer matrix: An infrared spectroscopy and thermal desorption study Peer-reviewed

      Shuhei Nagaoka, Takeshi Matsumoto, Kaori Ikemoto, Masaaki Mitsui, Atsushi Nakajima

      JOURNAL OF THE AMERICAN CHEMICAL SOCIETY129 ( 6 ) 1528 - +   2 2007

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      DOI: 10.1021/ja068442j

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    • Electronic properties of si and ge atoms doped in clusters: InnSim and InnGem Peer-reviewed

      Minoru Akutsu, Kiichirou Koyasu, Junko Atobe, Ken Miyajima, Masaaki Mitsui, Atsushi Nakajima

      JOURNAL OF PHYSICAL CHEMISTRY A111 ( 4 ) 573 - 577   2 2007

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      DOI: 10.1021/jp065921w

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    • π電子系分子クラスターの電子状態と集合構造の協同性 Invited Peer-reviewed

      三井正明, 中嶋敦

      Molecular Science1   A0007   2007

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    • Electronic and geometric stabilities of clusters with transition metal encapsulated by silicon Peer-reviewed

      Kiichirou Koyasu, Junko Atobe, Minoru Akutsu, Masaaki Mitsui, Atsushi Nakajima

      JOURNAL OF PHYSICAL CHEMISTRY A111 ( 1 ) 42 - 49   1 2007

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      DOI: 10.1021/jp066757f

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    • Experimental and theoretical characterization of aluminum-based binary superatoms of Al12X and their cluster salts Peer-reviewed

      Minoru Akutsu, Kiichirou Koyasu, Junko Atobe, Natsuki Hosoya, Ken Miyajima, Masaaki Mitsui, Atsushi Nakajima

      JOURNAL OF PHYSICAL CHEMISTRY A110 ( 44 ) 12073 - 12076   11 2006

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      DOI: 10.1021/jp065161p

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    • Room-temperature isolation of V(benzene)(2) sandwich clusters via soft-landing into n-alkanethiol self-assembled monolayers Peer-reviewed

      Shuhei Nagaoka, Takeshi Matsumoto, Eiji Okada, Masaaki Mitsui, Atsushi Nakajima

      JOURNAL OF PHYSICAL CHEMISTRY B110 ( 32 ) 16008 - 16017   8 2006

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      DOI: 10.1021/jp061806+

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    • Adiabatic electron affinities of oligophenyls: Anion photoelectron spectroscopy and density functional theory study Peer-reviewed

      Tsuneyuki Nakamura, Naoto Ando, Yukino Matsumoto, Shunsuke Furuse, Masaaki Mitsui, Atsushi Nakajima

      CHEMISTRY LETTERS35 ( 8 ) 888 - 889   8 2006

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      DOI: 10.1246/cl.2006.888

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    • Electronic properties of Cs-atom doped aluminum and silicon clusters: AlnCsm and SinCsm Peer-reviewed

      K Koyasu, M Akutsu, J Atobe, M Mitsui, A Nakajima

      CHEMICAL PHYSICS LETTERS421 ( 4-6 ) 534 - 539   4 2006

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      DOI: 10.1016/j.cplett.2006.01.118

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    • Photoelectron spectroscopy of binary Au cluster anions with a doped metal atom: AunM- (n=2-7), M = Pd, Ni, Zn, Cu, and Mg Peer-reviewed

      K Koyasu, Y Naono, M Akutsu, M Mitsui, A Nakajima

      CHEMICAL PHYSICS LETTERS422 ( 1-3 ) 62 - 66   4 2006

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      DOI: 10.1016/j.cplett.2006.02.034

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    • Soft-landing isolation of vanadium-benzene sandwich clusters on a room-temperature substrate using n-alkanethiolate self-assembled monolayer matrixes Peer-reviewed

      M Mitsui, S Nagaoka, T Matsumoto, A Nakajima

      JOURNAL OF PHYSICAL CHEMISTRY B110 ( 7 ) 2968 - 2971   2 2006

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      DOI: 10.1021/jp057194v

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    • Formation and photoelectron spectroscopy of nanoscale cluster anions of biphenyl, (BP)(n)(-) (n=2-100) Peer-reviewed

      M Mitsui, Y Matsumoto, N Ando, A Nakajima

      CHEMISTRY LETTERS34 ( 9 ) 1244 - 1245   9 2005

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    • Trapping of V(benzene)(2) sandwich clusters in a n-alkanethiol self-assembled monolayer matrix Peer-reviewed

      S Nagaoka, E Okada, S Doi, M Mitsui, A Nakajima

      EUROPEAN PHYSICAL JOURNAL D34 ( 1-3 ) 239 - 242   7 2005

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      DOI: 10.1140/epjd/e2005-00151-4

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    • Negative ion photoelectron spectroscopy of 2,2 '-bithiophene cluster anions, (2T)(-)(n) (n=1-100) Peer-reviewed

      M Mitsui, Y Matsumoto, N Ando, A Nakajima

      EUROPEAN PHYSICAL JOURNAL D34 ( 1-3 ) 169 - 172   7 2005

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      DOI: 10.1140/epjd/e2005-00139-0

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    • Selective formation of MSi16 (M = Sc, Ti, and V) Peer-reviewed

      K Koyasu, M Akutsu, M Mitsui, A Nakajima

      JOURNAL OF THE AMERICAN CHEMICAL SOCIETY127 ( 14 ) 4998 - 4999   4 2005

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      DOI: 10.1021/ja045380t

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    • Structural transition and electronic structure of π-conjugated organic nanocluster negative ions Invited

      The bulletin of the Society of Nano Science and Technology3 ( 2 ) 63 - 69   2005

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    • Lanthanide organometallic sandwich nanowires: Formation mechanism Peer-reviewed

      N Hosoya, R Takegami, J Suzumura, K Yada, K Koyasu, K Miyajima, M Mitsui, MB Knickelbein, S Yabushita, A Nakajima

      JOURNAL OF PHYSICAL CHEMISTRY A109 ( 1 ) 9 - 12   1 2005

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      DOI: 10.1021/jp0452103

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    • Negative ion photoelectron spectroscopy of acridine molecular anion and its monohydrate Peer-reviewed

      S Kokubo, N Ando, K Koyasu, M Mitsui, A Nakajima

      JOURNAL OF CHEMICAL PHYSICS121 ( 22 ) 11112 - 11117   12 2004

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      DOI: 10.1063/1.1818132

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    • Coexistence of two different anion states in polyacene nanocluster anions Peer-reviewed

      M Mitsui, S Kokubo, N Ando, Y Matsumoto, A Nakajima, K Kaya

      JOURNAL OF CHEMICAL PHYSICS121 ( 16 ) 7553 - 7556   10 2004

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      DOI: 10.1063/1.1809118

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    • Electronic structures of exohedral lanthanide-C-60 clusters Peer-reviewed

      J Suzumura, N Hosoya, S Nagao, M Mitsui, A Nakajima

      JOURNAL OF CHEMICAL PHYSICS121 ( 6 ) 2649 - 2654   8 2004

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      DOI: 10.1063/1.1767514

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    • Photoelectron spectroscopy of pyrene cluster anions, (pyrene)(-)(n) (n=1-20) Peer-reviewed

      N Ando, S Kokubo, M Mitsui, A Nakajima

      CHEMICAL PHYSICS LETTERS389 ( 4-6 ) 279 - 283   5 2004

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      DOI: 10.1016/j.cplett.2004.03.100

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    • Unusually large dynamic electron polarization in an O-2((1)Delta(g))-2,2,6,6-tetramethylpiperidine-1-oxyl radical system Peer-reviewed

      M Mitsui, K Takeda, Y Kobori, A Kawai, K Obi

      JOURNAL OF PHYSICAL CHEMISTRY A108 ( 7 ) 1120 - 1126   2 2004

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      DOI: 10.1021/jp035235m

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    • 気相ナノクラスターの材料化を目指したソフトランディング技術とナノデザイン Invited

      三井正明, 中嶋敦

      化学工業55   7 - 12   2004

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    • Quenching mechanism of excited coronene by a nitroxide radical studied by probing dynamic electron polarization Peer-reviewed

      M. Mitsui, Y. Kobori, A. Kawai, K. Obi

      J. Phys. Chem. A108   524 - 531   2004

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    • Coexistence of solvated electrons and solvent valence anions in negatively charged acetonitrile clusters, (CH3CN)(n)(-) (n=10-100) Peer-reviewed

      M Mitsui, N Ando, S Kokubo, A Nakajima, K Kaya

      PHYSICAL REVIEW LETTERS91 ( 15 ) 153002-1 - 153002-4   10 2003

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      DOI: 10.1103/PhysRevLett.91.153002

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    • Negative ion photoelectron spectroscopy of (benzene)(n)(-) (n=53-124) and (toluene)(n)(-) (n=33-139): Solvation energetics of an excess electron in size-selected aromatic hydrocarbon nanoclusters Peer-reviewed

      M Mitsui, A Nakajima, K Kaya

      JOURNAL OF CHEMICAL PHYSICS117 ( 21 ) 9740 - 9749   12 2002

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      DOI: 10.1063/1.1516793

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    • Photoelectron spectroscopy of palladium-doped gold cluster anions; Au-n,Pd- (n=1-4) Peer-reviewed

      K Koyasu, M Mitsui, A Nakajima, K Kaya

      CHEMICAL PHYSICS LETTERS358 ( 3-4 ) 224 - 230   5 2002

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    • Mass spectra and photoelectron spectroscopy of negatively charged benzene clusters, (benzene)(n)(-) (n=53-124) Peer-reviewed

      M Mitsui, A Nakajima, K Kaya, U Even

      JOURNAL OF CHEMICAL PHYSICS115 ( 13 ) 5707 - 5710   10 2001

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    • Time resolved ESR study on the photochemical reactions of pyrene and nitroxide radical system in micelle; formation of spin-correlated pyrene cation-nitroxide pairs Peer-reviewed

      A Kawai, A Shikama, M Mitsui, K Obi

      BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN74 ( 7 ) 1203 - 1211   7 2001

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    • Structure and dynamics of 9(10H)-acridone and its hydrated clusters. III. Microscopic solvation effects on nonradiative dynamics Peer-reviewed

      M Mitsui, Y Ohshima, O Kajimoto

      JOURNAL OF PHYSICAL CHEMISTRY A104 ( 38 ) 8660 - 8670   9 2000

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    • Structure and dynamics of 9(10H)-acridone and its hydrated clusters. II. Structural characterization of hydrogen-bonding networks Peer-reviewed

      M Mitsui, Y Ohshima, S Ishiuchi, M Sakai, M Fujii

      JOURNAL OF PHYSICAL CHEMISTRY A104 ( 38 ) 8649 - 8659   9 2000

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    • Structure and dynamics of 9(10H)-acridone and its hydrated clusters. I. Electronic spectroscopy Peer-reviewed

      M Mitsui, Y Ohshima

      JOURNAL OF PHYSICAL CHEMISTRY A104 ( 38 ) 8638 - 8648   9 2000

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    • Structural characterization of the acridine-(H<sub>2</sub>O)<i>n</i> (<i>n</i>=1-3) clusters by fluorescence-detected infrared spectroscopy

      Masaaki Mitsui

      Chemical Physics Letters   2000

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      DOI: 10.1016/S0009-2614(99)01386-X

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    • The first observation of CIDEP generated through the interaction between an excited singlet oxygen molecule and a free radical Peer-reviewed

      M Mitsui, K Takeda, Y Kobori, A Kawai, K Obi

      CHEMICAL PHYSICS LETTERS262 ( 1-2 ) 125 - 130   11 1996

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    • Absolute magnitude of spin polarization in the radical-triplet pair mechanism: CIDEP generation by level crossings in a triplet-doublet interaction Peer-reviewed

      Y Kobori, M Mitsui, A Kawai, K Obi

      CHEMICAL PHYSICS LETTERS252 ( 5-6 ) 355 - 361   4 1996

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      光アライアンス35 ( 10 ) 14 - 19   10 2024

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    • Triplet Nature and Oxygen Quenching of Excited States in Ligand-Protected Noble Metal Clusters Invited

      The bulletin of the Society of Nano Science and Technology21 ( 2 ) 61 - 69   3 2023

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    • Inclusion of C<sub>60</sub>@[10]CPP in a Cyclohexa-2,7-(4,5-diaryl)anthrylene Ethynylene Derivative

      米谷樹, 新堀佳紀, 三井正明, 茅原栄一, 山子茂, 小林健二

      基礎有機化学討論会要旨集32nd (CD-ROM)   2022

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      ナノ学会大会講演予稿集20th   2022

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    • Elucidation of the excited state relaxation processes of ligand-protected Au-Cu alloy clusters-Photon upconversion analysis approach-

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      ナノ学会大会講演予稿集20th   2022

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    • Synthesis of a Cyclohexa-2,7-(4,5-diaryl)anthrylene Ethynylene Derivative Replaced by Butadiyne Bonds at the Diagonal Position and Inclusion of [10]CPP

      米谷樹, 松木洋憲, 新堀佳紀, 三井正明, 茅原栄一, 山子茂, 小林健二

      基礎有機化学討論会要旨集31st (CD-ROM)   2021

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    • 対角位置をブタジインで置換した環状ヘキサ-2,7-(4,5-ジアリール)アントリレンエチニレン誘導体の合成と[10]CPP包接

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    • Synthesis of Cyclohexa-2,7-Anthrylene Ethynylene Derivative Partially Replaced by Butadiyne Bonds and Inclusion of [10]CPP

      米谷樹, 松木洋憲, 新堀佳紀, 三井正明, 茅原栄一, 山子茂, 小林健二

      日本化学会春季年会講演予稿集(Web)101st   2021

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    • Near-infrared-to-blue photon upconversion using thiolate-protected silver clusters as triplet sensitizers

      新堀佳紀, 和田悠幹, 三井正明

      ナノ学会大会講演予稿集19th   2021

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    • Excited triplet state formation in ligand-protected Au<sub>2</sub>Cu<sub>6</sub> clusters

      有馬大地, 新堀佳紀, 三井正明

      ナノ学会大会講演予稿集19th   2021

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    • Impact of phosphine ligands on the excited-state relaxation processes of Au<sub>2</sub>Cu<sub>6</sub> clusters

      有馬大地, 新堀佳紀, 三井正明

      分子科学討論会講演プログラム&要旨(Web)15th   2021

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    • Photon upconversion using ligand-protected gold clusters as triplet sensitizers

      和田悠幹, 新堀佳紀, 吉波拓巳, 小林健二, 三井正明

      分子科学討論会講演プログラム&要旨(Web)15th   2021

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    • Contribution of triplet nature to the emission process of highly luminescent Ag<sub>13</sub>Au<sub>12</sub> clusters

      三井正明, 小林有希, 有馬大地, 新堀佳紀

      分子科学討論会講演プログラム&要旨(Web)15th   2021

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    • Effect of ligand type on photon upconversion properties of platinum-doped silver clusters

      新堀佳紀, 内田惇木, 三井正明

      分子科学討論会講演プログラム&要旨(Web)15th   2021

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    • Synthesis of fluorescent organic ligand protected Au<sub>2</sub>Cu<sub>6</sub> clusters for photon upconversion

      高山竜一, 有馬大地, 新堀佳紀, 吉波拓巳, 小林健二, 三井正明

      分子科学討論会講演プログラム&要旨(Web)15th   2021

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    • 環状ヘキサ-2,7-(4,5-ジアリール)アントリレンエチニレン誘導体の合成と性質

      小林健二, 永島広大, 米谷樹, 松木洋憲, 河合信之輔, 新堀佳紀, 三井正明, 茅原栄一, 山子茂

      中部化学関係学協会支部連合秋季大会講演予稿集52nd (CD-ROM)   2021

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    • Photophysics of Thiolate-Protected Noble Metal Clusters: Current Understanding and Applications Invited

      新堀佳紀, 三井正明

      光化学52 ( 2 )   2021

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      Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

      J-GLOBAL

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    • The effects of counter ions on the optical properties of Ag<sub>25</sub> clusters

      高橋直也, 新堀佳紀, 三井正明

      ナノ学会大会講演予稿集18th   2020

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    • Effects of phosphine secondary ligands on photoluminescence and equilibrium properties of Ag<sub>29</sub> clusters

      高山竜一, 新堀佳紀, 三井正明

      ナノ学会大会講演予稿集18th   2020

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    • ペリレンジイミド配位子で修飾した金属クラスターの精密合成と光物性評価

      小林有希, 吉波拓巳, 新堀佳紀, 小林健二, 三井正明

      光化学討論会要旨集(CD-ROM)2019   2019

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    • 有機微結晶における三重項-三重項消滅アップコンバージョンの発光イメージング解析

      加藤望根, 豊島勇斗, 小林健二, 三井正明

      光化学討論会要旨集(CD-ROM)2019   2019

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    • 単一粒子発光分光によるCsPbBr<sub>3</sub>ナノ結晶の励起子緩和に対する酸素の影響

      本多秀伍, 新堀佳紀, 三井正明

      光化学討論会要旨集(CD-ROM)2019   2019

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    • 発光解析を用いた金属クラスターの平衡状態の評価

      新堀佳紀, 高橋直也, 三井正明

      光化学討論会要旨集(CD-ROM)2019   2019

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    • 発光解析に基づくAg<sub>29</sub>クラスターの配位子結合-解離反応における平衡定数の決定

      高橋直也, 新堀佳紀, 三井正明

      ナノ学会大会講演予稿集17th   2019

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    • 1分子計測による多重振子色素の固体環境下での発光挙動の解明

      三井正明, 水上俊成, 井上翔太, 小林健二

      固体・表面光化学討論会講演要旨集36th (Web)   2017

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    • 光誘起トンネル電流による界面電子移動反応分子の可視化法の開発 Invited

      三井正明

      (財)浜松科学技術研究振興会情報誌 財団ニュース12   2011

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      Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

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    • Infrared spectroscopy and thermal desorption study of vanadium–mesitylene 1:2 sandwich clusters soft-landed onto a long-chain N-alkanethiolate self-assembled monolayer Invited Peer-reviewed

      Masaaki Mitsui, Shingo Doi, Kaori Ikemoto, Shuhei Nagaoka, Atsushi Nakajima

      Latest Advances in Atomic Cluster Collisions: Structure and Dynamics from the Nuclear to the Biological Scale   199 - 204   1 1 2008

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      Language:English   Publishing type:Article, review, commentary, editorial, etc. (international conference proceedings)   Publisher:Imperial College Press  

      DOI: 10.1142/9781848162389_0016

      Scopus

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    • 水素終端シリコン基板に担持された金属ナノ粒子の2光子光電子分光

      中村恒幸, 松本剛士, 川端小百合, 宮島謙, 三井正明, 中嶋敦, 中嶋敦

      分子科学討論会講演要旨集(CD-ROM)1st   2007

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    • シリコン基板上に担持された金属ナノ粒子の2光子光電子分光

      中村恒幸, 松本剛士, 川端小百合, 宮島謙, 三井正明, 中嶋敦, 中嶋敦

      化学反応討論会講演要旨集23rd   2007

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    • Formation and Electronic Structures of One-Dimensional Lanthanide Organometallic Clusters

      細谷夏樹, 竹上竜太, 矢田啓蔵, 古瀬駿介, 三井正明, KNICKELBEIN Mark B., 藪下聡, 中嶋敦

      日本化学会講演予稿集86th ( 1 )   2006

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    • 希土類多層サンドイッチ有機金属クラスターの電場偏向実験

      細谷夏樹, KNICKELBEIN Mark B., 宮島謙, 宮島謙, 三井正明, 中嶋敦, 中嶋敦

      分子構造総合討論会講演要旨集(CD-ROM)2006   2006

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    • アルミニウム-リン混合成分クラスターの幾何構造と電子状態

      古瀬駿介, 阿久津稔, 細谷夏樹, 跡部純子, 宮島謙, 宮島謙, 三井正明, 中嶋敦, 中嶋敦

      分子構造総合討論会講演要旨集(CD-ROM)2006   2006

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    • フラーレンを超える分子!?正四面体Au20クラスター Invited

      三井正明

      化学61   63 - 64   2006

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      Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

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    • π電子系有機ナノクラスター負イオンの構造相転移と電子構造 Invited

      三井正明, 安藤直人, 松本由生乃, 中嶋敦, 茅幸二

      ナノ学会会報3 ( 2 ) 63 - 69   2005

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      Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher:ナノ学会会  

      CiNii Article

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    • New World in soft-nano-materials Invited

      K Kaya, A Nakajima, M Mitsui

      2005 International Conference on MEMS, NANO and Smart Systems, Proceedings   231 - 232   2005

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    • 気相ナノクラスターの材料化を目指したソフトランディング技術とナノデザイン Invited

      三井正明, 中嶋敦

      化学工業55 ( 1 ) 7 - 12   2004

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      Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)   Publisher:化学工業社  

      CiNii Article

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    • CIDEP in radical-singlet molecular oxygen system Peer-reviewed

      A Kawai, M Mitsui, Y Kobori, K Obi

      APPLIED MAGNETIC RESONANCE12 ( 4 ) 405 - 410   1997

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      Language:English   Publishing type:Article, review, commentary, editorial, etc. (international conference proceedings)  

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    ▼display all

    Books and Other Publications

    • 光化学の事典 = Encyclopedia of photochemistry

      光化学協会光化学の事典編集委員会, 伊藤, 紳三郎, 宍戸, 昌彦, 堀江, 一之, 真嶋, 哲朗(第9章 9.2 光電子分光)

      朝倉書店  6 2014  ( ISBN:9784254140965

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      Total pages:xvi, 418p   Language:Japanese

      CiNii Books

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    • Photoelectron Spectroscopy of Organic Clusters

      Masaaki Mitsui, Atsushi Nakajima( Role: Joint author)

      CRC press  2010 

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      Language:English Book type:Scholarly book

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    Professional Memberships

    Research Projects

    • トランスミッター配位子保護金属クラスターによる高効率フォトンアップコンバージョン固体材料の創製

      公益財団法 日本板硝子材料工学助成会  第45回(令和5年度)日本板硝子材料工学助成金 

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      4 2023 - 3 2026

      Authorship:Principal investigator 

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    • 顕微分光計測を駆使した三重項-三重項消滅アップコンバージョン固体系の空間分解分析

      日本学術振興会  科学研究費助成事業 基盤研究(C) 

      三井 正明

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      4 2020 - 3 2023

      Grant number:20K05653

      Grant amount:\4420000 ( Direct Cost: \3400000 、 Indirect Cost:\1020000 )

      三重項-三重項消滅に基づく光アップコンバージョン(UC)は、増感剤と発光体を組み合わせることにより、長波長の光を短波長の光に変換する手法であり、太陽光照射でも機能するため、太陽電池や光触媒などの効率を向上させる技術として注目されている。しかしながら、実用性の高い固体状態での高効率化が未だ実現できておらず、固体試料における増感剤と発光体の混合状態の微視的理解と制御が重要となる。本研究では、1分子レベルの発光計測が可能な顕微分光装置を用いた空間分解分析を、金属ポルフィリンの一種であるPdTPBP増感剤とアントラセン誘導体の1種であるDPAあるいはC7sDPA発光体の混合微結晶に適用し、結晶内の三重項エネルギー移動(TET)効率や増感剤・発光体の存在分布の可視化と定量評価に取り組んだ。
      PdTPBPとC7sDPAを約1:100000のモル比で混合したTHF溶液を、加熱したカバーガラス上に微量滴下し、溶媒を瞬時に蒸発させることで混合微結晶を作製した。発光イメージ測定には、C7sDPAを直接励起するための波長405 nmレーザーあるいはPdTPBPを励起するための波長640 nmレーザーを用いた。レーザー光は油浸対物レンズで回折限界まで集光して試料に照射した。試料からの発光は適切なフィルターを組み合わせることにより、発光体からのUC蛍光あるいは直接励起の蛍光を選択的に検出した。測定は全て減圧下にて行った。また、蛍光量子収率が既知のアントラセン誘導体の1分子計測を、UC測定時の光学セットアップで行うことにより、装置の検出効率を精密に評価した。UC蛍光強度の励起速度依存性測定を行い、高励起速度極限を仮定した速度論モデルを新たに構築し、結晶中における増感剤と発光体の存在量や増感剤-発光体間のTET効率を決定する解析手法を確立した。現在、この成果を国際論文誌に投稿するための準備を進めている。

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    • 有機・無機ナノ物質の光物性・励起子ダイナミクスおよびそれらを用いた光電変換デバイスに関する研究

      公益財団法人 岩谷直治記念財団  第44回(平成29年度)岩谷直治記念財団 岩谷科学技術研究助成 

      三井正明

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      4 2018 - 3 2019

      Authorship:Principal investigator  Grant type:Competitive

      Grant amount:\2000000 ( Direct Cost: \2000000 )

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    • Systematic investigation of heterogeneous interfacial charge transfer using single-molecule spectroscopy

      Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C) 

      Mitsui Masaaki

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      4 2015 - 3 2018

      Grant number:15K05398

      Authorship:Principal investigator  Grant type:Competitive

      Charge transfer dynamics under interfaces and film environments were investigated using single-molecule spectroscopy as follows:
      1) Photoblinking of single perylenediimide dyes in a poly(methylmethacrylate) (PMMA) film was investigated. We examined the bin-time dependencies of the cumulative distribution functions (CDF) of the on-time and off-time durations. The dispersive kinetics of on-time were attributed to radical ion pair ISC in PMMA. A simulation study revealed that the off-time CDF included power-law kinetics of charge hopping in the polymer. 2) Using a scanning MLE-KS method for a photoblinking analysis revealed multiple competitive kinetic processes at the interfaces between an Atto647N dye and TiO2. The injected electron from an excited dye to a trap state in TiO2 migrates due to trap-to-trap hopping, which follows power law kinetics, while the subsequent charge recombination between the oxidized dye and the injected electron follows log-normal kinetics.

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    • 光電流顕微計測による色素増感太陽電池の特性パラメータの統計分布 と相関の解明

      公益財団法人 住友財団  住友財団2013基礎科学研究助成 

      三井正明

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      1 2014 - 3 2016

      Authorship:Principal investigator  Grant type:Competitive

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    • Effect of structural fluctuation on excited-state reaction processes revealed by temperature-variable single-molecule fluorescence spectrosocopy

      Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C) 

      MITSUI MASAAKI

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      4 2012 - 3 2015

      Grant number:24550018

      Authorship:Principal investigator  Grant type:Competitive

      The effect of static/dynamic heterogeneities upon photophysico-chemical processes of fluorescent dyes in various environments were investigated using single-molecule spectroscopy. Consequently, 1) a 10-fold increase in the photostability of the anthracene-based guest due to supramolecular encapsulation was demonstrated. Furthermore, this complex is >30-fold more photostable than rhodamine 6G, 2) an entire picture of heterogeneous photo-induced charge transfer dynamics of single perylenediimide (PDI) molecules in a polymer matrix was revealed, and 3) the photo-induced reaction dynamics occurring in the system of PDI molecules embedded in γ-cyclodextrin (γCD) films were examined. The analyses of fluorescence blinking statistics and theoretical calculations suggest that the hydrogen atom transfer reaction probably occurs between PDI and γCD via higher-lying triplet n,π* states of PDI.

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    • Imaging and single-molecule detection of interfacial electron transfer molecules through photo-induced tunneling current

      Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research 

      MITSUI Masaaki

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      4 2011 - 3 2012

      Grant number:23655007

      Authorship:Principal investigator  Grant type:Competitive

      We have tried to develop a new methodology for realizing the imaging of adsorbed molecules prosecuting efficient electron transfer at metal oxide semiconductor interfaces. Photo-induced current measurements were performed for dye-sensitized solar cells having nanostructured TiO_2 electrodes covered with the Ru(II)-based sensitizers, and we confirmed that weak photoinduced current signals of several nA were highly discernible. The photocurrent measurement was successfully combined with the 2D raster scan of a diffraction-limited laser focal spot. We thereby established the basis of a photoinduced current microscopy toward the single-molecule detection of ultrafast electron transfer adsorbates.

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    • Elucidation of photophysico-chemical properties of single molecular nano-aggregates by using a low-temperature matrix isolation microscopy

      Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (A) 

      MITSUI Masaaki

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      4 2008 - 3 2012

      Grant number:20685001

      Authorship:Principal investigator  Grant type:Competitive

      Grant amount:\19700000 ( Direct Cost: \14329000 、 Indirect Cost:\5371000 )

      We have developed a variable-temperature single-molecule spectroscopy(SMS) apparatus and revealed photo physical/photochemical properties of several organic dyes and their nano-aggregates as follows. 1) The triplet lifetimes, intersystem crossing yields, and photobleaching yields for single-molecules of 9, 10-bis(phenylethynyl) anthracene embedded in polymer films were quantitatively determined. 2) We examined the electronic energy transfer(EET) in tetracence-doped p-terphenyl nanoparticles and theoretically revealed the origin of the extremely efficient EET in this system. 3) SMS of perylene bisimide(PDI) in aγ-cyclodextrin(γCD) solid film was performed, and we found that the hydrogen atom transfer reaction would take place between PDI andγCD in the inclusion complex.

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    • 光誘起トンネル電流による界面電子移動反応分子の可視化法の開発

      (財)浜松科学技術研究振興会  天野工業技術研究所基金研究助成金 

      三井正明

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      1 2010 - 3 2011

      Authorship:Principal investigator  Grant type:Competitive

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    • 機能性有機分子の低次元π電子ナノネットワーク構造の生成と評価

      文部科学省  科学研究費助成事業 

      三井正明

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      4 2008 - 3 2010

      Grant number:20050011

      Authorship:Principal investigator  Grant type:Competitive

      ・光増感型複合π電子系有機ナノ結晶の光物理化学過程と光物性の解明
      異なるπ電子系有機分子を光励起エネルギーのドナー(D)とアクセプター(A)として複合化した光増感型複合有機ナノ結晶を新たな分子ナノ集合系として生成し,そのDおよびA蛍光強度のDA混合比依存性(A/D=10^<-6>~10^<-1>)を定量的に評価した。複合ナノ結晶におけるDA間およびAA間のForster半径を見積もり,Forster励起エネルギー移動(FRET)効率のA/D値依存性を与えるモデルをForster理論に基づいて独自に構築した。さらにそれらをForster理論に基づいて構築したモデルによって解析し,DA,AA間のFRET効率のDA混合比依存性を明らかにした。これにより蛍光強度比のA/D値依存性を1つのパラメーターのみで非常に良く再現することに成功した。その結果,この系では光合成系のような2桁以上におよび光吸収断面積の増大効果によってA分子の励起状態を限られたナノ空間に高密度に生成させることができ,それを利用することでAA間の励起子対消滅効率を制御できることを明らかにした。この結果から,光増感型複合有機ナノ結晶が高効率な単一光子発生源として振る舞う可能性を示唆された。
      ・単一分子ナノ集合体の光子相互相関測定法の開発
      昨年度,独自に開発したレーザー走査顕微蛍光分光装置に,新たにHanbury-Brown-Twiss型光子相互相関計測システムを導入した。この装置では無偏光ビームスプリッターで1:1に分割した信号光子を2つの単一光子検出器でそれぞれ検出し,光子到達時間間隔のヒストグラムを時間相関単一光子計数法によって測定する。現在までに,連続光を励起光源とした光子相互相関測定に成功し,単一π電子系分子ナノ集合体の光子アンチバンチング挙動を調べることが可能となった。

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    • Study on Optical Properties of Organometallic Nano-clusters on a Substrate Using Optical Wave Guide Spectroscopy

      Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A) 

      NAKAJIMA Atsushi, MITSUI Masaaki, NAGAOKA Shuhei

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      2007 - 2010

      Grant number:19205004

      Grant amount:\49660000 ( Direct Cost: \38200000 、 Indirect Cost:\11460000 )

      Organometallic clusters having low dimensional network structures were size-selectively deposited with soft-landing technique, and the optical properties of isolated clusters were revealed. In this study, some experimental techniques, such as an optical wave-guide method, were newly developed, and the structures of deposited clusters were observed spectroscopically. Large-scale synthesis of lanthanide organometallic clusters was developed to measure optical properties with fluorescence spectroscopy, and optical response for europium organometallic clusters in the visible light region

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    • サイズ選択的電子状態プローブによる有機ナノ集合体の新奇な構造相転 移現象の探索

      日本学術振興会  科学研究費助成事業 

      三井正明

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      4 2005 - 3 2007

      Grant number:17750016

      Authorship:Principal investigator  Grant type:Competitive

      本最終年度では、高変換効率ラマンシフターの開発とπ電子系有機分子や核酸塩基の有機ナノ集合体の電子構造を負イオン光電子分光法によってサイズ選択的に調査した。さらに量子化学計算によって電子局在性や集合構造についても検討し、以下に述べるような成果を得た。
      (1)高変換効率ラマンシフターの開発
      50気圧以上で使用可能な高圧水素ガスラマンシフターを製作した。インジェクションシーダーを用いたNd^+:YAGレーザー一光の基本波(1064nm)ならびに2倍波(532nm)の後方散乱ストークス、反ストークス光を、10%程度の高変換効率を達成し、光電子分光測定におけるレーザー光源として使用することを可能とした。
      (2)有機ナノ集合体の電子状態と集合構造の協同性の解明
      オリゴフェニレンをはじめとするπ電子系分子が数〜数百個集合したナノ集合体負イオンの電子状態を系統的に研究した。その結果、集合数が増加するに従って電子局在性と集合構造の協同的な振る舞いの顕在化が、「二つの電子・幾何構造異性体の共存」という現象を通じて初めて見出された。これら二つの異性体の生成比は、集合体の温度によって劇的に変化し、さらに空間異方的なπ-π相互作用がこの協同現象発現に重要であることが分かった。
      チミンなどの核酸塩基で構成されるナノ集合体負イオンにおいて、集合数が増加するにつれて電荷局在状態と集合構造が協同的に転移することを初めて見出した。集合数が5分子以下では、余剰電荷は塩基1分子に強く局在化し、残りの塩基がそれを安定化する溶媒分子として振舞うことが分かった。このときの塩基は非水素結合相互作用によって結合しており、余剰電荷の存在が塩基問の水素結合形成を阻害していることが分かった。しかしながら、塩基が6分子以上集合すると、余剰電子が多点水素結合で結合したWatson-Crick型ダイマー内で非局在化している構造体へと構造転移することが分かった。この電子局在性と集合構造の協同性は、DNAの電荷移動機構の微視的理解へと繋がる興味深い結果である。

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    • 分子凝集および液滴粉砕による分子クラスターの気相合成とその物性 解明

      日本学術振興会  科学研究費助成事業 

      三井正明

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      4 2002 - 3 2005

      Grant number:14740332

      Authorship:Principal investigator  Grant type:Competitive

      本年度、オリゴアセン、オリゴフェニレンなどの一連のπ電子系有機化合物で構成されるナノクラスター負イオンに対して光電子分光法によるサイズ選択的な電子構造の観測を系統的に行い、以下に述べるような成果を得た。
      (1)ナフタレンやアントラセンなどのオリゴアセン化合物で構成されるナノメートルスケールの集合体(構成分子数が30個程度以上)に対して余剰電子を付着させると、余剰電子によって誘起される梼造緩和の程度が大きく異なる二つの安定状態が生成することを光電子分光法による電子構造の観測から初めて見出した。これら二つの安定状態の生成比に対する内部温度依存性やメチル基置換基効果を系統的に調べることによって、この現象が電子付着前の中性集合体における固体的状態と液体的状態の共存を反映したものであることを明らかにした。これはバルク結晶では見られないナノメートルスケールの集合体に特有の現象であり、極微小サイズの分子集合体の集合構造形態や電子構造に対してサイズや内部温度がどのような影響を与えるのかを初めて直接的に示したものである。
      (2)ビフェニル、p-ターフェニルなどのオリゴフェニレン類のナノ集合体(2-100量体)では、オリゴアセン類とは異なり、固-液共存を反映した二つの安定負イオン状態の共存は確認されなかった。しかしながら、ビフェニルとp-ターフェニルナノクラスター負イオンに対して得られた光電子スペクトルの比較から、両者においてスペクトルの形状や幅、電子束縛エネルギーのサイズ依存性が大きく異なることが見出された。この結果は、ビフェニルでは液体的なクラスターに対する電子付着によって負イオン状態が形成されるのに対し、p-ターフェニルでは固体的クラスターに対する電子付着によって負イオン状態が生成していることを示しており、分子サイズと分子構造の異方性の増大によってナノ集合体の熱力学特性が大きく変化することを明らかにすることができた。

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    • 電子スピン分極をプローブにした活性酸素種の反応ダイナミックス

      日本学術振興会  科学研究費助成事業 

      三井 正明

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      1998 - 1999

      Grant number:97J04412

      Grant amount:\1800000 ( Direct Cost: \1800000 )

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    Industrial property rights

    • 一次元多層有機金属錯体ナノ磁気素子及び一次元多層有機金属錯体

      中嶋敦, 三井正明, 宮島謙, 井上健一郎, 土居真吾, 安藤直人, 岡田英嗣, 長岡修平, マーク ニッケルバイン, 茅幸二

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      Application no:特願2003-407075  Date applied:5 12 2003

      Announcement no:特開2005-167119  Date announced:2 6 2005

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    Social Contribution

    • レーザー光で有機色素1分子を観察してみよう

      Lecturer, Advisor

      立教大学理学部  科学の未来を創る女子中高生チャレンジ・ラボ  5 8 2019 - 6 8 2019

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    • サイエンスカフェ in 静岡

      12 2010

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    Media Coverage

    • Featured Papers: "Unravelling the origin of dual photoluminescence in Au2Cu6 clusters by triplet sensitization and photon upconversion" Internet

      Advances In Engineering  https://advanceseng.com/unravelling-origin-dual-photoluminescence-au2cu6-clusters-triplet-sensitization-photon-upconversion/  9 2022

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      Author:Other 

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    • Single Atoms Make A Difference Internet

      ChemistryViews  https://www.chemistryviews.org/details/ezine/11287589/Angewandte_Chemie_62021_Single_Atoms_Make_A_Difference/  6 2021

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      Author:Other 

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    • https://www.chem-station.com/blog/2021/06/pu.html Internet

      6 2021

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    • 「金属クラスターを用いた近赤外-可視光変換」に世界で初めて成功!

      福井新聞  https://www.fukuishimbun.co.jp/articles/-/1263636  2 2021

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    • 「金属クラスターを用いた近赤外-可視光変換」に世界で初めて成功! Newspaper, magazine

      毎日新聞  https://mainichi.jp/articles/20210219/pls/00m/020/509000c  2 2021

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      Author:Other 

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    • 立教大学理学部化学科 光物理化学研究室(三井研究室) Promotional material

      日本油化学会  オレオサイエンス  オレオサイエンス Vol.18:No.2  2 2018

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      Author:Myself 

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