Mechanically activated switching of Si-based single-molecule junction as imaged with three-dimensional dynamic probe

Miki Nakamura, Shoji Yoshida, Tomoki Katayama, Atsushi Taninaka, Yutaka Mera, Susumu Okada, Osamu Takeuchi and Hidemi Shigekawa ()
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Miki Nakamura: Faculty of Pure and Applied Sciences, University of Tsukuba
Shoji Yoshida: Faculty of Pure and Applied Sciences, University of Tsukuba
Tomoki Katayama: Faculty of Pure and Applied Sciences, University of Tsukuba
Atsushi Taninaka: Faculty of Pure and Applied Sciences, University of Tsukuba
Yutaka Mera: Shiga University of Medical Science
Susumu Okada: Faculty of Pure and Applied Sciences, University of Tsukuba
Osamu Takeuchi: Faculty of Pure and Applied Sciences, University of Tsukuba
Hidemi Shigekawa: Faculty of Pure and Applied Sciences, University of Tsukuba

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Understanding and extracting the full functions of single-molecule characteristics are key factors in the development of future device technologies, as well as in basic research on molecular electronics. Here we report a new methodology for realizing a three-dimensional (3D) dynamic probe of single-molecule conductance, which enables the elaborate 3D analysis of the conformational effect on molecular electronics, by the formation of a Si/single molecule/Si structure using scanning tunnelling microscopy (STM). The formation of robust covalent bonds between a molecule and Si electrodes, together with STM-related techniques, enables the stable and repeated control of the conformational modulation of the molecule. By 3D imaging of the conformational effect on a 1,4-diethynylbenzene molecule, a binary change in conductance with hysteresis is observed for the first time, which is considered to originate from a mechanically activated conformational change.

Date: 2015
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DOI: 10.1038/ncomms9465

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