Tolerance to Stretching in Thiol-Terminated Single-Molecule Junctions Characterized by Surface-Enhanced Raman Scattering

S. Kobayashi, S. Kaneko, M. Kiguchi, K. Tsukagoshi, T. Nishino

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We investigated the change in the metal-molecule interaction in a 1,4-benzenedithiol (BDT) single-molecule junction using a combination of surface-enhanced Raman scattering spectra and current-voltage curves. During the stretching process, the conductance of the junction systematically decreased, accompanied by an increase in the vibrational energy of the CC stretching mode. By analyzing the current-voltage curves and Raman spectra, we found that the interaction between the πorbital of BDT and the electronic states of Au was diminished by the orientation change of BDT during the stretching process. A comparison with a 4,4′-bipyridine single-molecule junction revealed that the reduction of coupling of the Au-S contacts was smaller than that of Au-pyridine contacts. Therefore, the electronic states originating from the contact geometry are responsible for the tolerance to the stretching of thiol-Terminated molecular junctions.

Original languageEnglish
Pages (from-to)6712-6717
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume11
Issue number16
DOIs
Publication statusPublished - 2020 Aug 20
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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