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In situ XAFS studies on the growth of ZnSe quantum dots

✍ Scribed by Jinxiang Song; Jing Zhang; Zhi Xie; Shiqiang Wei; Zhiyun Pan; Tiandou Hu; Yaning Xie

Publisher
Elsevier Science
Year
2010
Tongue
English
Weight
212 KB
Volume
619
Category
Article
ISSN
0168-9002

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✦ Synopsis

The growth mechanism of glutathione (GSH) capped ZnSe quantum dots (QDs) obtained from the aqueous synthesis method is studied by in situ X-ray absorption fine structure (XAFS) utilizing a flow reactor and synchrotron radiation. Detailed analysis of the Se K-edge EXAFS data reveals that the growth of ZnSe QDs from aqueous synthesis undergoes a fast nucleation process and then a slow growth stage, which follows the two-stage growth mechanism. The ZnSe QDs are strained to minimize the total free energy, and the contraction of Se-Zn bond relaxes with time. This shows the promising capability of in situ XAFS to investigate the growth process of nano-materials synthesized by chemical solution method.

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