Surface-Enhanced Raman Scattering Stimulated by Strong Metal-Molecule Interactions in a C60Single-Molecule Junction

Koji Yasuraoka, Satoshi Kaneko, Shuji Kobayashi, Kazuhito Tsukagoshi, Tomoaki Nishino

Research output: Contribution to journalArticlepeer-review

Abstract

Specifying the geometric and electronic structures of a metal-molecule interface at the single-molecule level is crucial for the improvement of organic electronics. A single-molecule junction (SMJ) can be used to investigate interfaces because it can be regarded as an elementary unit of the interface structure. Although considerable efforts have been made to this end, the detection of structural changes in SMJs associated with metal-molecule interactions remains challenging. In this study, we detected the surface-enhanced Raman scattering (SERS) signal originating from the metal-molecule interaction change induced by a local structural change in a C60 SMJ. This junction has attracted wide attention owing to its unique electronic and vibronic properties. We fabricated a C60 SMJ using a lithographically fabricated Au electrode and measured the SERS spectra along with the current-voltage (I-V) response. By continuous measurement of SERS for the C60 SMJ, we obtained SERS spectra dependent on the local structural change. The analysis of the I-V response revealed that the vibration energy shift originates from the change in the local structure for different Au-C60 interactions. Based on the discrimination of the states in accordance with the Au-C60 interaction, we found that the probability of SERS for geometry with a large Au-C60 interaction was enhanced.

Original languageEnglish
Pages (from-to)51602-51607
Number of pages6
JournalACS Applied Materials and Interfaces
Volume13
Issue number43
DOIs
Publication statusPublished - 2021 Nov 3

Keywords

  • C
  • current-voltage response
  • interface structure
  • metal-molecule interaction
  • single-molecule junction
  • surface-enhanced Raman scattering

ASJC Scopus subject areas

  • Materials Science(all)

Fingerprint

Dive into the research topics of 'Surface-Enhanced Raman Scattering Stimulated by Strong Metal-Molecule Interactions in a C<sub>60</sub>Single-Molecule Junction'. Together they form a unique fingerprint.

Cite this