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Phys Chem Chem Phys. 2012 May 21;14(19):6817-25. doi: 10.1039/c2cp24147a. Epub 2012 Apr 11.

In situ identification of the adsorption of 4,4'-thiobisbenzenethiol on silver nanoparticles surface: a combined investigation of surface-enhanced Raman scattering and density functional theory study.

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  • 1School of Chemistry and Environment, Beijing University of Aeronautics & Astronautics, 37 Xue Yuan Road, Hai Dian District, Beijing, 100191, China. pgyin@buaa.edu.cn guolin@buaa.edu.cn.

Abstract

We investigated the configuration characteristic and adsorption behavior of 4,4'-thiobisbenzenethiol (TBBT) on the surface of silver nanoparticles (NPs). Under different conditions and preparation processes, several possible surface species were produced including single-end adsorption on a silicon wafer, double-end adsorption and bridge-like adsorption. Although consisting of the same molecule and nano material, different adsorption systems exhibited different spectral characteristics in the surface-enhanced Raman spectroscopy (SERS). A density functional theory (DFT) study further verified the corresponding adsorption states. The combined SERS-DFT study provided a framework towards investigating and designing adsorption systems at a molecular level, indicating the potential use in applications such as nano-sensors.

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