Enhancement of the Stability of ZnSe Nanocrystals Doped in Silica by a New Method

Abstract

Abstract: ZnSe nanocrystals doped in silica were prepared by using sol-gel process and in situ growth technique. It was found that when n(Zn):n(Se)=1:1 in the sol precursor, the resultant ZnSe nanocrystals were rather instable and after several days the color of the ZnSe nanocrystals-doped SiO₂ glass changed from yellow to red. According to the analysis results of XRD, UV-Vis transmission spectra and XPS, the existence of many zinc vacancies in the ZnSe nanocrystals was considered as the reason of the instability. Based on this reason, the synthesis process was improved by introducing much larger amount of zinc to the precursor sol and this made the stability of the ZnSe nanocrystals improved greatly from several days to more than 6 months.

Key words: ZnSe, Nanocrystals, Stability, Zn vacancies

CLC Number:

O₄82

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KONG Fan-Tao, WANG Min-Qiang, WANG Yun-Peng, YAO Xi, JIANG Hai-Qing . Enhancement of the Stability of ZnSe Nanocrystals Doped in Silica by a New Method[J]. Chem. J. Chinese Universities, 2005, 26(1): 155.

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Enhancement of the Stability of ZnSe Nanocrystals Doped in Silica by a New Method

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