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Title
Japanese: 
English:Surface-Enhanced Raman Scattering Stimulated by Strong Metal–Molecule Interaction in C60 Single-Molecule Junction 
Author
Japanese: 安楽岡浩司, 金子哲, 小林柊司, 塚越一仁, 西野智昭.  
English: Koji Yasuraoka, Satoshi Kaneko, Shunya Kobayashi, Kazuhito Tsukagoshi, Tomoaki Nishino.  
Language English 
Journal/Book name
Japanese: 
English:ACS applied materials & interfaces 
Volume, Number, Page Vol. 13    No. 43    pp. 51602-51607
Published date Oct. 25, 2021 
Publisher
Japanese: 
English:ACS Publications 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Official URL https://pubs.acs.org/doi/full/10.1021/acsami.1c09965
 
DOI https://doi.org/10.1021/acsami.1c09965
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.

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