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Electromechanical Properties of Single-Molecule Junctions

Research Project

Project/Area Number 20K05245
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 28010:Nanometer-scale chemistry-related
Research InstitutionTokyo Institute of Technology

Principal Investigator

Fujii Shintaro  東京工業大学, 理学院, 特任准教授 (70422558)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords単分子接合 / ブレイクジャンクション / 電気伝導度 / 熱起電力 / 分子接合 / 単分子 / 輸送特性 / 力学応答 / プローブ顕微鏡
Outline of Research at the Start

単分子接合では界面構造や分子配座が可逆的に変化し、電子状態、電気輸送特性、熱電特性などの物性が可変的な力学応答性を示す。そこで、単分子接合の構造・電子状態を決定するために、単分子の配座、界面構造、電子状態を決定法を開発する。開発した計測法を統合し、構造と電子状態、電子物性の相関を解明する。そして、単分子接合における物性・機能の発現機構を明らかにする。更に、単分子接合に積極的に応力を与えることで、分子―金属界面の軌道の重なりや分子配座を変える。そして、既存の物質を超える巨大熱起電力、絶縁性の有機分子の金属化、単分子ダイオード機能などの、従来の物質には現れない物性・機能を発現させる。

Outline of Final Research Achievements

Single-molecule junctions have attracted attention for their application as single-molecule devices and as model systems for metal-molecule interfaces in organic electronic devices. In single-molecule junctions, the interface structure and molecular conformation change reversibly, and the properties such as electrical transport and thermoelectric properties exhibit tunable mechanical response. In this study, we investigate the mechanical modulation of thermoelectric properties of single-molecule junctions by mechanically changing the molecular orientation and the structure of the molecule-metal interface. We confirmed that the thermopower of single-molecule junctions can be increased or decreased by applying mechanical external forces. Theoretical simulations revealed that the t thermopower modulates in response to mechanically induced changes in the metal-molecule interface structure and molecular orbital energy.

Academic Significance and Societal Importance of the Research Achievements

単分子接合の物性の力学的応答性に着目し、従来の孤立分子や結晶では発現しない、または隠れていた物性の解明を行った。単分子接合ではナノメートルスケールの微小な電極変位に起因する外力に対し、熱電能が応答性を示すことを見出した。本研究は、将来の分子エレクトロニクス実装に必要な、熱電特性を制御する新たな力学的なアプローチのひとつを提供するものである。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (20 results)

All 2023 2022 2021 2020 Other

All Int'l Joint Research (1 results) Journal Article (6 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 6 results,  Open Access: 1 results) Presentation (11 results) (of which Int'l Joint Research: 6 results,  Invited: 1 results) Book (2 results)

  • [Int'l Joint Research] Czech Academy of Sciences(チェコ)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Scanning probe microscopy study of functionalized nanographene2022

    • Author(s)
      Fujii Shintaro
    • Journal Title

      Carbon Reports

      Volume: 1 Issue: 2 Pages: 79-88

    • DOI

      10.7209/carbon.010205

    • ISSN
      2436-5831
    • Year and Date
      2022-06-01
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Mechanically Tuned Thermopower of Single‐Molecule Junctions2022

    • Author(s)
      Fujii Shintaro、Montes Enrique、Cho Haruna、Yue Yi、Koike Masaaki、Nishino Tomoaki、V?zquez H?ctor、Kiguchi Manabu
    • Journal Title

      Advanced Electronic Materials

      Volume: 8 Issue: 12 Pages: 2200700-2200700

    • DOI

      10.1002/aelm.202200700

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Structural Asymmetry of Metallic Single-Atom Contacts Detected by Current?Voltage Characteristics2022

    • Author(s)
      Isshiki Yuji、Li Dongzhe、Kiguchi Manabu、Nishino Tomoaki、Pauly Fabian、Fujii Shintaro
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 14 Issue: 9 Pages: 11919-11926

    • DOI

      10.1021/acsami.1c24096

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Electronic Structure and Transport Properties of Single-molecule Junctions with Different Sizes of π-conjugated System2021

    • Author(s)
      Y. Isshiki, T. Nishino, S. Fujii
    • Journal Title

      J. Phys. Chem. C

      Volume: 125 Issue: 6 Pages: 3472-3479

    • DOI

      10.1021/acs.jpcc.0c05478

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Hybrid Molecular Junctions Using Au-S and Au-π Bindings2020

    • Author(s)
      S. Fujii, M. Iwane, S. Furukawa, T. Tada, T. Nishino, M. Saito, M. Kiguchi
    • Journal Title

      J. Phys. Chem. C

      Volume: 124 Issue: 17 Pages: 9261-9268

    • DOI

      10.1021/acs.jpcc.9b11725

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Selective formation of molecular junctions with high and low conductance states by tuning the velocity of electrode displacement2020

    • Author(s)
      Isshiki Yuji、Fujii Shintaro、Nishino Tomoaki、Kiguchi Manabu
    • Journal Title

      Physical Chemistry Chemical Physics

      Volume: 22 Issue: 8 Pages: 4544-4548

    • DOI

      10.1039/c9cp06487g

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 単分子接合の電子状態の応力応答2023

    • Author(s)
      一色裕次, 西野智昭, 藤井慎太郎
    • Organizer
      第70回 応用物理学会 春季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Thermal and thermoelectric properties of molecular junctions2023

    • Author(s)
      Shintaro Fujii
    • Organizer
      A3 Foresight International Symposium 2022, Functionalization and Flexible Device Application of Atomic Scale Organic and Inorganic Material
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 単分子膜における分子―金属間の界面構造と熱伝導性2022

    • Author(s)
      藤井 慎太郎, 庄子 良晃, 福島 孝典, 西野 智昭
    • Organizer
      応用物理学会秋季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Electronic Structure of a Single-Molecule Junction during the Junction-Breaking Process2022

    • Author(s)
      Y. Isshiki, E. Montes, N. P. Arasu, T. Nishino, H. Vazquez, S. Fujii
    • Organizer
      The 9th International Symposium on Surface Science (ISSS-9)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Mechanically Tuned Thermopower of Single-Molecule Junctions2022

    • Author(s)
      S. Fujii, E. Montes, H. Cho, Y. Yue, M. Koike, M. Kiguchi, H. Vazquez, T. Nishino
    • Organizer
      The 9th International Symposium on Surface Science (ISSS-9)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Times Resolved Electronic Structures of Single Molecule Junctions by Fast Current-Voltage Measurements2022

    • Author(s)
      Y. Isshiki, S. Fujii, T. Nishino
    • Organizer
      MANA international Symposium 2021 jointly with ICYS
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 単分子熱起電力の機械的変調2022

    • Author(s)
      Y,長 はる菜,藤井 慎太郎,西野 智昭
    • Organizer
      日本化学会 第102春季年会
    • Related Report
      2021 Research-status Report
  • [Presentation] 単一分子接合のクロミズムと熱電能2022

    • Author(s)
      藤井 慎太郎,庄子 良晃,福島 孝典,西野 智昭
    • Organizer
      第69回応用物理学会春季学術講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] Electronic Structure of a Single-Molecule Junction during the Junction-Breaking Process2021

    • Author(s)
      Y. Isshiki, E. Montes, N. P. Arasu, T. Nishino, H. Vazquez, S. Fujii
    • Organizer
      The 9th International Symposium on Surface Science (ISSS-9)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Mechanically Tuned Thermopower of Single-Molecule Junctions2021

    • Author(s)
      S. Fujii, E. Montes, H. Cho, Y. Yue, M. Koike, M. Kiguchi, H. Vazquez, T. Nishino
    • Organizer
      The 9th International Symposium on Surface Science (ISSS-9)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] 単分子熱起電力の機械的変調2021

    • Author(s)
      藤井 慎太郎,長 はる菜,西野 智昭,木口 学
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Research-status Report
  • [Book] 図説表面分析ハンドブック Chapter 23.1原子間力顕微鏡2021

    • Author(s)
      122.藤井慎太郎
    • Total Pages
      6
    • Publisher
      朝倉書店
    • ISBN
      9784254201703
    • Related Report
      2021 Research-status Report
  • [Book] 図説表面分析ハンドブック Chapter 24.1走査トンネル顕微鏡2021

    • Author(s)
      122.藤井慎太郎
    • Total Pages
      6
    • Publisher
      朝倉書店
    • ISBN
      9784254201703
    • Related Report
      2021 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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