摘要
以硫脲为表面修饰剂对CdS进行表面修饰,并将CdS分散在PVP(聚乙烯吡咯烷酮)的乙醇水溶液中,用紫外可见吸收光谱分析了各种反应条件对CdS纳米粒子量子尺寸效应的影响.结果表明,将硫脲用于CdS纳米粒子的表面修饰能有效地降低CdS纳米粒子的粒径,大大提高了其量子尺寸效应.硫脲与Cd2+之间的不同比例、硫脲修饰前后溶液的pH值对CdS纳米粒子的量子尺寸效应产生了明显的影响.在pH值为2.00,硫脲与Cd2+比例为8∶1的条件下,得到了粒径大小为5nm、粒径分布均匀的CdS纳米粒子.TEM观察到的结果与Brus公式计算的结果是一致的.
Surface-capped CdS nanoparticles were synthesized by using thiourea as capping agent and PVP (poly N-vinyl-2-pyrrolidone) as stab ilizer. The quantum size effect of the nanoparticles was characterized by UV-Vi s absorption spectra. The effects of different capping agent, the ratios of thio urea to Cd2+, and pH on the band edge of the CdS nanoparticles were studie d in detail. The results revealed that higher thiourea/Cd2+ ratios led to higher stability, smaller size and narrower size distribution. The quantum size effect of the surface-capped and uncapped CdS nanoparticles was effectively inf luenced by the pH of the solution. On the condition that pH=2.00 and thiourea/Cd 2+ ratio=8/1, the average particles size of the obtainedsurfaced capped CdS was abou t 5nm and the size distribution was narrow.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2003年第4期450-454,共5页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金重大资助项目(69890230)
教育部跨世纪优秀人才培养计划基金.
