Scanning Tunneling Microscopy Observation of Apparent Molecular Motion Induced by Polarity Change of Electric Fields

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概要

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• We observed apparent molecular motion induced by the polarity change of electric fields by scanning tunneling microscopy (STM), when small amounts of asymmetrical disulfides including susceptible terphenyl moiety to an electric field were embedded into dodecanethiol self-assembled monolayers (SAMs). By taking the direction of the dipole moment into account, the thickness of embedded molecular parts should become larger at the positive bias. However, STM experiments revealed that the thickness of both the molecular protrusions was larger at the negative bias, contrary to this prediction. As a result of scanning tunneling spectroscopy (STS), we concluded that this apparent molecular motion of the embedded asymmetrical disulfides was caused by higher rectification property (or conductance change) of the electrically active terphenyl moiety in mixed SAMs.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2003-08-15

著者

• FUKUSHIMA Hitoshi

  Joint Research Center for Harmonized Molecular Materials (JACHMM), Japan Chemical Innovation Institu

• TAMAKI Takashi

  Institute for Materials and Chemical Process (IMCP), National Institute of Advanced Industrial Scien

• Tokumoto Hiroshi

  Nanotechnology Research Center Research Institute For Electronic Science Hokkaido University

• Ishida Takao

  Institute of Mechanical Systems Engineering (IMSE), National Institute of Advanced Industrial Science and Technology (AIST), and PRESTO-Japan Science and Technology Corporation (JST), Tsukuba, Ibaraki 305-8564, Japan

• Tokumoto Hiroshi

  Nanotechnology Research Institute (NRI), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8562, Japan

• Tamaki Takashi

  Institute for Materials and Chemical Process, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan

• Fukushima Hitoshi

  Joint Research Center for Harmonised Molecular Materials (JRCHMM) Japan Chemical Innovation Institute (JCII) c/o AIST Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan

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