Analytical Sciences

Enhanced Raman Scattering as a Probe for 4-Mercaptopyridine Surface-modified Copper Oxide Nanocrystals

Yanfei WANG,* Hailong HU,* Shengyu JING,** Yunxin WANG,* Zhihua SUN,* Bing ZHAO,* Chun ZHAO,** and John R. LOMBARDI***

*Key Laboratory for Supramolecular Structure and Materials of Ministry of Education, Jilin University, 2699 Qianjin Avenue, Changchun 130012, P. R. China
**Joint State Key Laboratory on Integrated Optoelectronics, Jilin University, Changchun 130012, P. R. China
***Department of Chemistry, The City College of New York, New York, NY 10031, USA

We report on the application of Raman scattering as a probe to study 4-mercaptopyridine (4-Mpy) surface-modified CuO nanocrystals. Enhanced Raman scattering from 4-Mpy adsorbed on CuO nanocrystals was observed. The Raman signals displayed 10² enhancement compared with those of 4-Mpy in solution. We compared the Raman spectra of 4-Mpy molecules adsorbed on CuO nanocrystals and Ag, Cu substrate. A particular feature of the semiconductor substrate that was different from the metal substrate was revealed. The excitation wavelength-dependent behavior was clearly observed.

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