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Open Access Nano Express

Microwave-assisted synthesis of water-dispersed CdTe/CdSe core/shell type II quantum dots

Li-Man Sai and Xiang Yang Kong*

Author Affiliations

School of Material Science and Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Shanghai 200240, People's Republic of China

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Nanoscale Research Letters 2011, 6:399  doi:10.1186/1556-276X-6-399

Published: 27 May 2011

Abstract

A facile synthesis of mercaptanacid-capped CdTe/CdSe (core/shell) type II quantum dots in aqueous solution by means of a microwave-assisted approach is reported. The results of X-ray diffraction and high-resolution transmission electron microscopy revealed that the as-prepared CdTe/CdSe quantum dots had a core/shell structure with high crystallinity. The core/shell quantum dots exhibit tunable fluorescence emissions by controlling the thickness of the CdSe shell. The photoluminescent properties were dramatically improved through UV-illuminated treatment, and the time-resolved fluorescence spectra showed that there is a gradual increase of decay lifetime with the thickness of CdSe shell.