期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 138, 期 4, 页码 1294-1300出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b11559
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) [26102013, 2511008, 21340074]
- Asahi glass
- Murata Foundation
- Grants-in-Aid for Scientific Research [26288070, 15J11830, 15K17842, 15F15334, 26102013, 16K13975, 26620122, 16K14018] Funding Source: KAKEN
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.
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