He Yao, Lu Hao-Ting, Sai Li-Man, Lai Wen-Yong, Fan Qu-Li, Wang Lian-Hui, Huang Wei
Institute of Advanced Materials (IAM), Fudan University, 220 Handan Road, Shanghai 200433, People's Republic of China.
J Phys Chem B. 2006 Jul 13;110(27):13370-4. doi: 10.1021/jp057498h.
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.
本文介绍了一种新颖的在水相中生长高质量CdTe/CdS核壳纳米晶体的微波辅助方法。通过CdS壳层的外延生长，光致发光量子产率（PLQY）得到了极大提高。在最佳条件下，所制备的纳米晶体的PLQY无需任何后处理即可高达75%。此外，这些研究表明，由于微波辐射的特殊特性，它对纳米晶体的快速外延生长非常有用。结果，与传统光照方法（需要几天时间）相比，微波合成足够节省时间（仅需五分钟）就能获得最佳量的CdTe/CdS核壳纳米晶体。因此，当前的这项研究不仅提供了一种用于生产高荧光CdTe/CdS核壳纳米晶体的快速微波合成方法，而且还展示了微波合成相对于光照方法的一些优势。
