Molecular Electronics under Electrochemical Environment

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  • YOKOTA Yasuyuki
    Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology Local Spatio-Temporal Functions Laboratory, Frontier Research System, RIKEN (The Institute of Physical and Chemical Research)
  • MIYAZAKI Akira
    Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology
  • FUKUI Ken-ichi
    Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology
  • ENOKI Toshiaki
    Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology
  • TAMADA Kaoru
    Local Spatio-Temporal Functions Laboratory, Frontier Research System, RIKEN (The Institute of Physical and Chemical Research) Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
  • HARA Masahiko
    Local Spatio-Temporal Functions Laboratory, Frontier Research System, RIKEN (The Institute of Physical and Chemical Research) Department of Electronic Chemistry, Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology

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Other Title
  • 電気化学環境下における分子エレクトロニクス研究
  • デンキ カガク カンキョウカ ニ オケル ブンシ エレクトロニクス ケンキュウ

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Abstract

We report the studies of redox-active ferrocene (Fc) and tetrathiafulvalene (TTF) derivative islands embedded in n-decanethiol self-assembled monolayers on Au(111) using electrochemical scanning tunneling microscopy (EC-STM). We performed EC-STM measurements of both islands of varied sizes at various potentials in 0.05 M HClO4 solution. While the apparent height of Fc islands depended on the tip and sample potentials, that of TTF islands did not depend on the potentials except in the case of very small islands (less than ten molecules). Furthermore, the larger the size of TTF islands, the higher the apparent height in the STM images. This is quite contrary to the case of Fc islands where the apparent height did not depend on the island size. We rationalize these behaviors in terms of the differences in intermolecular interaction and effective electron transfer between redox-active moieties.

Journal

  • Hyomen Kagaku

    Hyomen Kagaku 29 (4), 253-259, 2008

    The Surface Science Society of Japan

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