CdS/SiO2复合材料的低频Raman散射研究

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散射射的二级散射峰根据实验结果加以指认，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

Low Frequency Raman Scattering of CdS Nanocrystallites Embedded in Silicate Glasses

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.