CdS/SiO_2复合材料的低频Raman散射研究  

Low Frequency Raman Scattering of CdS Nanocrystallites Embedded in Silicate Glasses

作　　者：隗罡[1] 王凯旋[1] 黄建滨[1] 赵璧英[1] 

机构地区：[1]北京大学物理化学研究所,北京100871

出　　处：《物理化学学报》1997年第3期230-235,共6页Acta Physico-Chimica Sinica

基　　金：国家科委基础性研究重大项目

摘　　要：对用溶胶凝胶法制备的CdS／SiO2复合材料进行低频Raman散射研究，结果表明可从其低频Raman散射峰位计算出CdS微晶的粒径．两种不同的低频振动模式由激发光的两种偏振方向加以区分．低频Raman散射峰的二级散射峰根据实验结果加以指从．所得平均粒径结果与透射电镜观察结果有较好的对应关系．复合材料吸收光谱吸收边蓝移与CdS纳米粒子粒径之间存在着密切的关系．实验证明，样品吸收边能量与CdS平均粒径的平方有很好的反比关系．Small size CdS crystal doped silica glasses were prepared by sol-gel process. The results showed that the CdS microcrystal sizes can be calculated from the peaks in their low fre-quency inelastic Raman scattering spectra (LOFIRS). Two types of the vibrational modes were discriminated by the polarized spectra. The second-order Raman scattering peaks were assigned from the exprimental results. The results of average paticle sizes from LOFIRS can correspond to those from TEM. The blue shift in the optical absorption of the obtained glasses was closely related with the size of CdS microcrystallites. The expriment verified that there was a good inverse proportion relationship between the energy of absorption edges and the square of the size of CdS nanocrystallites.

关 键 词：半导体玻璃 喇曼散射 硫化镉 二氧化硅 纳米粒子 

分 类 号：TQ171.719[化学工程—玻璃工业]