“反胶团法”合成的CdS半导体纳米粒子的光谱性质研究

反相胶束是指由介于油和水界面的表面活性剂分子, 稳定、且均匀分散于连续油介质中的微液滴。它可以作为“微反应器”合成性能优良的CdS粒子。文章研究了反相胶束的W值(W=水]/表面活性剂])、Cd2+]与S2-]的比例和Cd2+和S2- 离子的起始浓度对CdS纳米粒子发光特性均有明显影响。回流处理可以对CdS纳米粒子的表面进行修饰，可以使CdS粒子的缺陷发光减弱并消失而显著增强激子发射，同时可增大粒径使激子发射峰位红移，体现了明显的量子限域效应; 所得材料的室温最大荧光量子效率高达11%。

Properties of Synthesized CdS Nanoparticles by Reverse Micelle Method

Micelle system with reverse phase (water/CTAB/n-hexyl alcohol/n-heptane) is a weenie liquid-globelet of surface active agent molecule which can be stably and uniformly dispersed in continuous oil medium. The micelle system with reverse phase can work as a "micro-reactor" to synthesize CdS nano-particle with excellent performance. In the present article considering the effects of W value (W=water]/surface agent]) of the micelle system with reverse phase, we observed that the ratio of Cd2 ] and S2-] ions to the original concentrations of the Cd2 and S2-ions can affect the luminescent properties of CdS nano-particle. Using regurgitant treatment process the surface of CdS nano-particle can be modified, and as a result the defect emission was reduced and even disappeared, but exciton emissions markedly increased. On the other hand, a red-shift of the exciton emission peak with the increase in the particle size was observed, indicating considerable quantum confinement effect. A maximum quantum efficiency of 11% for the synthesized CdS nano-material was achieved.