期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 115, 期 37, 页码 18378-18383出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp206455a
关键词
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资金
- National Natural Science Foundation of P. R. China [20903044, 20873050, 20921003, 20973074]
- 111 project [B06009]
- National Institute of Justice, Office of Justice Programs [2006-DN-BX-K034]
- U.S. Department of Justice
A model metal-semiconductor-molecule-metal assembly has been designed for probing the charge-transfer (CT) mechanism of surface-enhanced Raman scattering (SERS). We measured the SERS of ZnO-PATP-Ag, Au-ZnO-PATP-Ag, and Cu-ZnO-PATP Ag assemblies at excitation wavelengths of 514.5, 785, and 1064 nm. Our results demonstrate that the metal-semiconductor contact can alter the charge distribution through p-aminothiophenol (PATP) molecules. This is attributed to the chemical SERS enhancement mechanism with additional electrical transport properties within these assemblies. These inhibit the CT from the metal to the molecule, resulting in the different degrees to which CT contributes to the overall SEAS enhancement of PATP.
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