J. Phys. Chem. C, 112 (4), 996 -1000, 2008. 10.1021/jp077467h S1932-7447(07)07467-5
Web Release Date: January 9, 2008

Copyright © 2008 American Chemical Society

Mercaptopyridine Surface-Functionalized CdTe Quantum Dots with Enhanced Raman Scattering Properties

Yanfei Wang, Junhu Zhang, Huiying Jia, Minjie Li, Jianbo Zeng, Bai Yang, Bing Zhao,* and Weiqing Xu

State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, People's Republic of China

John R. Lombardi*

Department of Chemistry, The City College of New York, New York, New York 10031

Received: September 17, 2007

In Final Form: October 28, 2007

Abstract:

We report that 3 nm diameter CdTe quantum dots can generate enhanced Raman scattering. The Raman signal of 4-mercaptopyridine (4-Mpy) adsorbed on CdTe quantum dots shows a 104 enhancement compared with that of bulk 4-Mpy. The enhanced phenomenon based on CdTe quantum dots also provides new insight to help understand the enhancement mechanism. A charge-transfer mechanism is most likely responsible for the observed enhancement, since plasmon resonances are ruled out. This study points to the possibility of using quantum dots, with chemisorption in some important practical systems, such as the application of quantum dots as nanosized building blocks and markers in biological imaging.

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