Single-molecule conductance of μ-conjugated rotaxane: New method for measuring stipulated electric conductance of μ-Conjugated molecular wire using STM break junction

Manabu Kiguchi, Shigeto Nakashima, Tomofumi Tada, Satoshi Watanabe, Susumu Tsuda, Yasushi Tsuji, Jun Terao

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

An electronic conductance with small fluctuations, which is stipulated in single-molecule junctions, is necessary for the precise control of single-molecule devices. However, the suppression of conductance fluctuations in conventional molecular junctions is intrinsically difficult because the fluctuations are related to the contact fluctuations and molecular motion. In the present study involving experimental and theoretical investigations, it is found that covering a single μ-conjugated wire with an α-cyclodextrin molecule is a promising technique for suppressing conductance fluctuations. The conductance histogram of the covered molecular junction measured with the scanning tunneling microscope break-junction technique shows that the conductance peak for the covered junction is sharper than that of the uncovered junction. The covering technique thus has two prominent effects: the suppression of intramolecular motion, and the elimination of intermolecular interactions. Theoretical calculations of electronic conductance clearly support these experimental observations. Covering a single μ-conjugated wire with an α-cyclodextrin molecule is a promising technique for suppressing conductance fluctuations. The peak in the conductance histogram of the covered molecular junction is sharper than that of the uncovered junction. The covering technique has two prominent effects: the suppression of intramolecular motion, and the elimination of intermolecular interactions.

Original languageEnglish
Pages (from-to)726-730
Number of pages5
JournalSmall
Volume8
Issue number5
DOIs
Publication statusPublished - Mar 12 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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