Preparation of Fluorescent SiO2 Particles with Single CdTe Nanocrystal Cores by the Reverse Microemulsion Method

Authors

  • Y. Yang,

    1. Key Laboratory of Colloid, Interface Science and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Zhong Guan Cun, Bei Yi Jie 2, Beijing 100080, P.R. China
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  • M. Y. Gao

    1. Key Laboratory of Colloid, Interface Science and Chemical Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Zhong Guan Cun, Bei Yi Jie 2, Beijing 100080, P.R. China
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  • The authors acknowledge Prof. Dadong Yan, Prof. Jiushu Shao, and especially Prof. H. Möhwald for stimulating discussions. The current investigations were financially supported by an 863 project (2002AA302 201) and a NSFC project (20225313). Supporting Information is available online from Wiley InterScience or from the author.

Abstract

original image

Highly fluorescent CdTe@SiO2 core–shell-structured spheres (see Figure) are prepared via hydrolysis and condensation of tetraethyl orthosilicate in water-in-oil emulsions. Systematic results reveal that the electrostatic interactions between negatively charged CdTe nanocrystals (NCs) and silica intermediates play a critical role in determining the final structures of the resultant particles. Following this mechanism, the number of CdTe NCs encapsulated in silica spheres is successfully tuned.

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