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

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• 作者：Yanfei Wang ; Junhu Zhang ; Huiying Jia ; Minjie Li ; Jianbo Zeng ; Bai Yang ; Bing Zhao ; Weiqing Xu ; John R. Lombardi
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：January 31, 2008
• 年：2008
• 卷：112
• 期：4
• 页码：996 - 1000
• 全文大小：103K
• 年卷期：v.112,no.4(January 31, 2008)
• ISSN：1932-7455

文摘

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