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Non-contact measurement of single molecular devices by soft X-ray electron spectroscopy

Research Project

Project/Area Number 21K20538
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0501:Physical chemistry, functional solid state chemistry, organic chemistry, polymers, organic materials, biomolecular chemistry, and related fields
Research InstitutionHiroshima University

Principal Investigator

Niozu Akinobu  広島大学, 先進理工系科学研究科(理), 助教 (60910320)

Project Period (FY) 2021-08-30 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords自己組織化単分子膜 / 電荷移動 / 電子移動 / 分子素子 / 軟X線
Outline of Research at the Start

本研究では放射光源から供給される軟X線ビームを利用し、分子素子の導電性を非接触に評価する手法の開発を行う。実験では金基板上に吸着した分子に軟X線を照射し、放出されるオージェ電子の運動エネルギーを精密に測定する。電子の運動エネルギー変化に注目することで、フェムト秒(1000兆分の1秒)程度の極短時間に起こる分子から基板への電荷移動過程を観測する。構造の異なる分子について電荷移動時間をそれぞれ計測し、分子の導電性を評価する。

Outline of Final Research Achievements

In this study, we attempted to evaluate the conductivity of molecular devices in a non-contact manner using soft X-ray electron spectroscopy. Self-assembled monolayers (SAMs) of biphenyl derivatives with different torsional angles between the two benzene rings were prepared on Au substrates as a model system for molecular devices. Soft X-ray electron spectroscopy was performed on the SAMs to observe the charge transfer dynamics. Based on the difference in the obtained Auger electron spectra, we identified a change in the charge transfer time dependent on the torsional angle.

Academic Significance and Societal Importance of the Research Achievements

本研究ではビフェニル分子のねじれ角に依存して電荷移動時間が変化することを見出し、軟X線光電子分光法による分子の非接触導電性評価を実証した。この結果から、分子構造と電荷移動ダイナミクスの関係についての基礎的な知見が得られた。また今後この手法を発展させることで、他の多く分子系について同様の非接触導電性評価が可能となると期待される。

Report

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

    (9 results)

All 2022 2021

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results) Presentation (7 results) (of which Int'l Joint Research: 4 results,  Invited: 3 results)

  • [Journal Article] Surface explosion and subsequent core expansion of laser-heated clusters probed by time-resolved photoelectron spectroscopy2022

    • Author(s)
      Niozu Akinobu、Fukuzawa Hironobu、Hagiya Toru、Yamamoto Akifumi、You Daehyun、Saito Shu、Ishimura Yudai、Togashi Tadashi、Owada Shigeki、Tono Kensuke、Yabashi Makina、Wada Shin-ichi、Matsuda Kazuhiro、Ueda Kiyoshi、Nagaya Kiyonobu
    • Journal Title

      Physical Review A

      Volume: 106 Issue: 4 Pages: 043116-043116

    • DOI

      10.1103/physreva.106.043116

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Crystallization kinetics of atomic crystals revealed by a single-shot and single-particle X-ray diffraction experiment2021

    • Author(s)
      Niozu Akinobu、Owada Shigeki、Tono Kensuke、Kameshima Takashi、Joti Yasumasa、Katayama Tetsuo、Togashi Tadashi、Yabashi Makina、Matsuda Kazuhiro、Bostedt Christoph、Ueda Kiyoshi、Nagaya Kiyonobu他
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 118 Issue: 51

    • DOI

      10.1073/pnas.2111747118

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Probing transient structures of nanoparticles by single particle X-ray diffraction2022

    • Author(s)
      Akinobu Niozu
    • Organizer
      FEL2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Exploring transient structures of nanoparticles by ultrafast X-ray diffraction2022

    • Author(s)
      Akinobu Niozu
    • Organizer
      IWP-RIXS-2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Time-resolved photoelectron spectroscopy of laser-heated clusters at SACLA BL12022

    • Author(s)
      Akinobu Niozu
    • Organizer
      LSC2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 内殻励起反応計測で探るビフェニル単分子膜における電荷移動ダイナミクス2022

    • Author(s)
      仁王頭明伸
    • Organizer
      第16回分子科学討論会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 内殻励起反応計測によるビフェニル単分子膜の非接触導電性評価2022

    • Author(s)
      仁王頭明伸
    • Organizer
      第36回日本放射光学会年会・放射光科学合同シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] 単粒子X線回折で探る希ガスナノ粒子の結晶化ダイナミクス2022

    • Author(s)
      仁王頭明伸
    • Organizer
      第35回日本放射光学会年会・放射光科学合同シンポジウム
    • Related Report
      2021 Research-status Report
  • [Presentation] Characterization of self-assembled monolayers of methyl-ester terminated naphthalenethiol2022

    • Author(s)
      Akinobu Niozu
    • Organizer
      The 26th Hiroshima International Symposium on Synchrotron Radiation
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-10-22   Modified: 2024-01-30  

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