Site-Selection in Single-Molecule Junction for Highly Reproducible Molecular Electronics

Satoshi Kaneko, Daigo Murai, Santiago Marqués-González, Hisao Nakamura, Yuki Komoto, Shintaro Fujii, Tomoaki Nishino, Katsuyoshi Ikeda, Kazuhito Tsukagoshi, Manabu Kiguchi

Research output: Contribution to journalArticlepeer-review

71 Citations (Scopus)


Adsorption sites of molecules critically determine the electric/photonic properties and the stability of heterogeneous molecule-metal interfaces. Then, selectivity of adsorption site is essential for development of the fields including organic electronics, catalysis, and biology. However, due to current technical limitations, site-selectivity, i.e., precise determination of the molecular adsorption site, remains a major challenge because of difficulty in precise selection of meaningful one among the sites. We have succeeded the single site-selection at a single-molecule junction by performing newly developed hybrid technique: simultaneous characterization of surface enhanced Raman scattering (SERS) and current-voltage (I-V) measurements. The I-V response of 1,4-benzenedithiol junctions reveals the existence of three metastable states arising from different adsorption sites. Notably, correlated SERS measurements show selectivity toward one of the adsorption sites: "bridge sites". This site-selectivity represents an essential step toward the reliable integration of individual molecules on metallic surfaces. Furthermore, the hybrid spectro-electric technique reveals the dependence of the SERS intensity on the strength of the molecule-metal interaction, showing the interdependence between the optical and electronic properties in single-molecule junctions.

Original languageEnglish
Pages (from-to)1294-1300
Number of pages7
JournalJournal of the American Chemical Society
Issue number4
Publication statusPublished - 2016 Feb 3
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry


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