巯基乙胺稳定的水溶性CdTe纳米粒子的合成与表征

用巯基乙胺(cysteamine，CA)作为稳定剂，在水相中合成了发光可调的CdTe半导体纳米粒子。这些巯基乙胺稳定的CdTe纳米粒子表面带有大量的正电荷。实验结果表明，稳定剂与Cd的比例以及pH等实验条件对CdTe纳米粒子体系的荧光发射强度影响较大。在pH为6.1时，纳米粒子体系在橙红波段的荧光量子产率达到了9%左右。控制实验条件，合成了各种尺寸的CdTe纳米粒子，荧光发射光谱在520～600 nm范围连续可调。分别用X射线光电子能谱(XPS)，透射电子显微镜(TEM)，X射线衍射仪(XRD)，红外吸收

Synthesis and Characterization of CdTe Nanoparticles Stabilized by Cysteamine

The water-soluble size controllable CdTe nanoparticles have been synthesized using cysteamine (CA) hydrochloride as stabilizer. The experimental results showed that the synthesis conditions including pH and molar ratios of the ligands (CA) to monomers (Cd²⁺ ions) in the precursor solution played an important role in the photoluminescence (PL) quantum yield (QY) of the as-prepared CdTe NCs. At pH=6.1, the maximum fluorescent emission peak appeared in the orange-red window, and the maximum PL QY was about 9% at room temperature without any post-preparative treatment. By controlling the reflux time, CdTe nanoparticles with different sizes were synthesized, and the PL ranged from 520 to 600 nm. TEM, XRD, XPS and FTIR were used to characterize the size, shape, and composition of CdTe nanoparticles.