Scanning Tunneling Microscopy with Molecular Tips

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  • NISHINO Tomoaki
    Department of Chemistry, School of Science, The University of Tokyo
  • UMEZAWA Yoshio
    Department of Chemistry, School of Science, The University of Tokyo

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Other Title
  • 分子探針を用いる走査型トンネル顕微鏡
  • ブンシタンシン オ モチイル ソウサガタ トンネル ケンビキョウ

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Abstract

We describe herein the concept, principle, and experimental results of molecular tips for chemically selective STM. It has been shown that molecular tips allow chemically selective imaging based upon the hydrogen bond, metal coordination, and charge-transfer interactions between the sample and tip molecules. These chemical interactions result from facilitated electron tunneling through overlapped electronic wave functions between the sample and tip molecules. The selectivity can be tailored upon designing functional groups of the tip molecules. Although most of the molecular tips were prepared by utilizing self-assembled monolayers, polypyrrole or carbon nanotubes immobilized onto underlying STM tips also allowed chemically selective imaging. In addition, the molecular tips enabled the conformational analysis and detection of intermolecular electron transmission from a single molecule to another adjacent single molecule.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 54 (6), 417-426, 2005

    The Japan Society for Analytical Chemistry

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