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纳米尺度的半导体超微粒在线性和非线性光学方面表现出来的奇特性质使其成为研究和开发新的功能材料的热点。成键为 S、P轨道的 - 族金属硫化物半导体 ,电子结构和晶体结构均较为简单 ,结晶性能好 -界面无序结构少 ,在纳米尺度上其结构仍与体相材料近似 ,因此 ,成为研究量子尺寸效应的理想材料。本文对采用化学微乳液法合成的 Cd S半导体超微粒的光谱性质进行了研究 ,实验结果显示 ,Cd S超微粒样品的吸收光谱的带边与体相相比发生了蓝移 ;从吸收光谱中可以看到 ,Cd S超微粒样品的吸收边随粒径减少而向短波方向移动。拉曼光谱的电子—— L O声子耦合在粒子尺寸 2 .4- 2 .9nm范围内与粒子尺寸无关
The peculiar nature of nano-scale semiconductor ultrafine particles in both linear and nonlinear optics has made them a hot spot for research and development of new functional materials. The metal-sulfide semiconductors with S and P orbitals are relatively simple in electronic structure and crystal structure with good crystallinity - less interfacial disordered structure, and their structure is still similar to the bulk material at the nanoscale. Therefore, The ideal material for studying quantum size effects. In this paper, the spectral properties of CdS semiconductors synthesized by chemical microemulsion method have been studied. The experimental results show that the band edge of the absorption spectrum of CdS ultra-fine particles has a blue shift compared with the bulk phase. From the absorption spectra It can be seen that the absorption edge of the CdS ultrafine particles moves to the shortwave as the particle size decreases. The electron-L O phonon coupling in the Raman spectrum has no relation to particle size in the range of particle size 2.4-4.2 nm