期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 39, 页码 22439-22444出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b06001
关键词
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资金
- National Natural Science Foundation of P. R. China [21273091, 21221063, 21327803, 21411140235, 21073072]
- 111 project [B06009]
- Development Program of the Science and Technology of Jilin Province [20110338, 20130305005GX]
With the explosive development of analysis and detection techniques based on surface-enhanced Raman scattering (SERS), the further understanding and exploitation of the chemical mechanism becomes particularly important. We investigated the charge transfer (CT) effect on SERS in a semiconductor molecule metal system constructed with Ag NPs, 4-mercaptobenzoic acid (MBA) molecule, and atomic level TiO2. To ensure more ordering, the system is constructed by a layer-by-layer self-assembly method. After introducing TiO2, we found that the relative band intensity of some peaks displayed a distinct difference, which is attributed to the Herzberg Teller contribution that occurs via CT. We also proposed a possible mechanism responsible for the selective enhancement observed in the SERS spectra of the Ag NPs/MBA/TiO2 system. This work will not only provide much deeper insight into the CT mechanism in SERS but also help in the development of a method to construct metal semiconductor-based SERS substrates.
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