用硫脲为表面修饰剂,并用PVP(聚乙烯吡咯烷酮)为稳定剂在乙醇水溶液中合成了粒径分布均匀、性能稳定、有机物修饰的CdS纳米颗粒.重点分析了硫脲的引入对CdS纳米粒子晶体结构、粒径分布、紫外可见吸收光谱、红外光谱、光致荧光光谱(PL)的影响.发现硫脲修饰使得CdS纳米粒子的粒径更小,粒径分布更加均匀,并且有效地抑止了PVP对CdS荧光淬灭,在PL光谱上观察到了CdS的带隙发光. Thiourea was used as surface modifier, and PVP (polyvinylpyrrolidone) was used as stabilizing agent to synthesize CdS nanoparticles with uniform size distribution, stable performance and organic modification in ethanol aqueous solution. The effects of thiourea on CdS nanoparticles Crystal structure, particle size distribution, UV-visible absorption spectrum, infrared spectrum and PL spectrum were studied.The results showed that the particle size of CdS nanoparticle was smaller and the particle size distribution was more uniform and inhibited effectively PVP fluorescence quenching of CdS, observed in the PL spectrum CdS bandgap luminescence.