摘要
在高分子聚乙烯醇存在下 ,Cd2 + 与S2 - 反应生成黄色CdS纳米微粒。当CdS浓度小于 5× 1 0 - 4 mol L时 ,它在 4 70nm产生一个最强RRS峰 ,这是由低浓度较小粒径黄色CdS纳米微粒或黄色CdS分子与光源相互作用的结果 ;当CdS浓度大于 7.5× 1 0 - 4 mol L时 ,在 5 2 0nm产生一个最强的特征RRS峰。黄色CdS纳米微粒体系在可见光区无吸收峰。当CdS纳米微粒的浓度在 7.5× 1 0 - 4 ～ 2 .0× 1 0 - 3mol L范围内 ,所得纳米粒子的粒径为 4 3nm。实验表明
There is a strongest Rayleigh scattering peak at 470 nm for CdS nanoparticle when its concentration is less than 5x10(-4) mol/L, in the presence of polyvinyl alcohol. When the concentration is more than 7.5x10(-4) mol/L, a strongest resonance Rayleigh scattering peak appears at 520 nm. There is no absorption peak for the yellow nanoparticle system. However, the concentration in the range of 0similar to2x10(-3) mol/L CdS is linear to its A(400 nm). The effect of lamp house and the concentration of reagents on the resonance Rayleigh scattering were studied. The diameter of CdS nanoparticle is about 43 nm when its concentration is in the range of 7.5x10(-4)similar to2.0x10(-3) mol/L. The results show that the un-distribution emission intensity of Xe lamp, and the formation of CdS nanoparticle in big size are important factors to produce resonance scattering peaks.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2003年第3期315-317,共3页
Chinese Journal of Analytical Chemistry
基金
国家自然科学基金 (No .2 0 175 0 18)
广西自然科学基金 (No .0 14 4 0 3)
重庆市自然科学基金资助项目
