Self-Assembly and Redox Properties of Viologen Derivatives on Au(111) Determined by Cyclic Voltammetry and Scanning Tunneling Microscopy

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概要

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• The self-assembly and redox properties of viologen derivatives [N-methyl-N$'$-di(10-mercaptodecyl)-4,4$'$-bipyridinium; HSC10VC10SH] immobilized on a Au(111) substrate were investigated by ultrahigh vacuum scanning tunneling microscopy (UHV-STM) and cyclic voltammetry. We demonstrate here a novel self-assembly monolayer (SAM) matrix appropriate for the isolation of viologen molecules. An octanethiol was used as the SAM matrix, in which the HSC10VC10SH was inserted at molecular lattice defects. The isolated single molecules of viologen derivatives inserted in the SAM matrix were observed as protrusions in STM topography using a constant current mode. We measured the conformational change of the viologen molecular protrusions using STM and investigated the changes in the width and height of the alkyl group, which were due to the change in the polarity of viologen molecules caused by the electron charge.

• 2008-02-25

著者

• KWON Young-Soo

  Department of Electrical Engineering & NTRC, Dong-A University

• Qian Dong-jin

  Institute Of Advanced Materials Fudan University

• LEE Nam-Suk

  Department of Electrical Engineering & CIIPMS, Dong-A University

• SHIN Hoon-Kyu

  NCNT, Pohang University of Science and Technology

• Choi Won-Suk

  Department of Electrical Engineering and Nano Engineering, Dong-A University, 840 Hadan-2dong, Saha-gu, Busan 604-714, Korea

• Qian Dong-Jin

  Institute of Advanced Materials, Fudan University, Shanghai 200433, China

• Lee Nam-Suk

  Department of Electrical Engineering and Nano Engineering, Dong-A University, 840 Hadan-2dong, Saha-gu, Busan 604-714, Korea

• Shin Hoon-Kyu

  NCNT, Pohang University of Science and Technology, San 31, Hyoja-dong, Nam-gu, Pohang 790-784, Korea

• Kwon Young-Soo

  Department of Electrical Engineering and Nano Engineering, Dong-A University, 840 Hadan-2dong, Saha-gu, Busan 604-714, Korea

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