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Proceedings Paper

Synthesis and characterization of water soluble CdTe and CdTe/CdS core-shell quantum dots for biosensing applications
Author(s): Shichao Xu; Jimei Zhang; Caixia Liu; Xiuyun Song
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Paper Abstract

We synthesized bare CdTe and core-shell CdTe/CdS quantum dots (QDs) using 3-mercapto propanoic acid as stabilizer by an improved method in aqueous solutions. The optimum conditions for preparation of highly luminescent bare CdTe QDs (CdTe core) were investigated and proposed to be pH 7.0 and 3h of refluxing under room temperature. Transmission electron microscopy (TEM) image showed well dispersed particles, and the average QDs size was c.a. 2.5 nm determined via TEM. The quantum yield (QY) of CdTe QDs for photoluminescence was calculated, and 51.4% of QY can be achieved without any further purification. Furthermore, we capped the bare CdTe with CdS semiconductor materials and produced luminescent core-shell CdTe/CdS QDs. Three processes were evaluated to obtain the best QY of core-shell CdTe/CdS QDs. Process 2 and 3 reached 14.9% and 14.5% of QY after 19h and 0.5h of refluxing respectively, both results are better than that of 2.5% of QY and 52h of refluxing in process 1. Red-shift of maximum emission wavelength (from 551 nm to 680 nm), observed from fluorescence spectrum, revealed the formation of core-shell CdTe/CdS QDs.

Paper Details

Date Published: 1 November 2007
PDF: 6 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64235F (1 November 2007); doi: 10.1117/12.780123
Show Author Affiliations
Shichao Xu, Tianjin Polytechnic Univ. (China)
Jimei Zhang, Tianjin Polytechnic Univ. (China)
Caixia Liu, Harbin Institute of Technology (China)
Xiuyun Song, Tianjin Polytechnic Univ. (China)

Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering
Shanyi Du; Jinsong Leng; Anand K. Asundi, Editor(s)

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