Facile synthesis of magic-sized CdSe and CdTe nanocrystals with tunable existence periods

作者：Quanqin Dai, Dongmei Li, Jingjing Chang, Yanli Song, Shihai Kan, Haiyong Chen, Bo Zou, Weiqing Xu, Shuping Xu, Bingbing Liu, Guangtian Zou · 发表于：Nanotechnology · 年份：2007 · DOI：10.1088/0957-4484/18/40/405603 · 被引用次数：43 · 研究领域：Quantum Dots Synthesis And Properties、Chalcogenide Semiconductor Thin Films、Nanocluster Synthesis and Applications

A facile and reproducible approach for the synthesis of magic-sized CdSe and CdTe nanocrystals is established. The as-synthesized CdSe nanocrystals exhibit strong and fixed absorption features with unusually narrow emission spectra. White-light emission can be achieved by two different routes. One is to mix colours emitted from both the magic-sized nanocrystals and the subsequently transformed regular-sized nanocrystals; the other is to expose the magic-sized nanocrystals to ambient conditions. A systematic study of the nanocrystal formation process shows that monomer activity and injection/growth temperatures are important parameters to the growth kinetics of magic-sized nanocrystals. Variation of these parameters provides tunable existence periods in the hot solution.