Chen Qi-Fan, Yang Dong-Zhi, Xu Shu-Kun, Qu Zheng
Department of Chemistry, Northeastern University, Shenyang 110004, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2007 Apr;27(4):650-3.
Water-soluble CdTe nanocrystals capped with cysteamine were synthesized rapidly in aqueous solution by microwave irradiation with controllable temperature. Absorption and fluorescence spectra showed that these prepared CdTe quantum dots had good optical properties. The structure and diameter were characterized by the transmission electron microscopy (TEM) and X-ray powder diffraction (XRD). The effects of heating temperature, irradiation time and the concentrations of cysteamine on the growing velocity of CdTe QDs synthesized were also investigated. With the increase in the temperature and concentration of cysteamine, the nanoparticles grow faster, and for a longer reaction time, the maximum emission wavelength of the nanoparticles shows a red shift. Compared with the conventional aqueous synthesis, the microwave irradiation method showed some advantages such as the rapid velocity, good dispersibility and uniformity, narrow FWHM (full width at half maximum) and high quantum yield.
通过微波辐射在水溶液中快速合成了用半胱胺包覆的水溶性碲化镉纳米晶体，温度可控。吸收光谱和荧光光谱表明，这些制备的碲化镉量子点具有良好的光学性质。通过透射电子显微镜（TEM）和X射线粉末衍射（XRD）对其结构和直径进行了表征。还研究了加热温度、辐照时间和半胱胺浓度对合成的碲化镉量子点生长速度的影响。随着温度和半胱胺浓度的增加，纳米颗粒生长得更快，并且反应时间越长，纳米颗粒的最大发射波长出现红移。与传统的水相合成相比，微波辐射法具有速度快、分散性和均匀性好、半高宽窄和量子产率高的优点。
