Microwave-assisted growth and characterization of water-dispersed CdTe/CdS core-shell nanocrystals with high photoluminescence
Microwave-assisted growth and characterization of water-dispersed CdTe/CdS core-shell nanocrystals with high photoluminescence
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DOI：
10.1021/jp057498h
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发表时间：
2006-07-13
影响因子：
3.3
通讯作者：
Huang, Wei
中科院分区：
文献类型：
--
作者：
He, Yao;Lu, Hao-Ting;Huang, Wei
本文提出了一种在水相中微波辅助生长高质量CdTe/CdS核壳纳米晶体的新方法。CdS壳的外延生长大大提高了光致发光量子产率（PLQY）。在最佳条件下，制备的纳米晶无需任何后处理，PLQY高达75%。此外，这些研究表明，微波辐射由于其特殊的特性，对于纳米晶体的快速外延生长非常有用。因此，与传统的照明方法（需要几天）相比，微波合成足够节省时间（只需要5分钟）来获得最佳数量的CdTe/CdS核壳纳米晶体。因此，本研究不仅为制备高荧光CdTe/CdS核壳纳米晶体提供了一种快速的微波合成方法，而且与照明方法相比，也展示了微波合成的一些优势。
A novel microwave-assisted method of growth of high-quality CdTe/CdS core-shell nanocrystals in the aqueous phase is presented in this paper. The photoluminescence quantum yield (PLQY) is greatly enhanced by epitaxial growth of the CdS shell. Under optimum conditions, the PLQY of as-prepared nanocrystals reaches as high as 75% without any post-treatment. Furthermore, these investigations demonstrate that microwave irradiation is tremendously useful for fast epitaxial growth of nanocrystals due to its special characteristics. As a result, the microwave synthesis is sufficiently time-economizing (only five minutes are required) to obtain optimum amounts of CdTe/CdS core-shell nanocrystals in comparison to the conventional illumination method (several days are required). Therefore, this current research not only provides a rapid microwave synthesis for producing highly fluorescent CdTe/CdS core-shell nanocrystals, but also it presents some advantages of the microwave synthesis in comparison to the illumination method.