摘要
本文作者通过溶胶-凝胶法获得块材CdS纳米颗粒/介孔SiO2组装体系(CdS/SiO2)块体样品,室温下的拉曼谱中观察到CdS的两个特征峰;在氮气和空气气氛中退火处理后,发现吸收边位置随复合量和退火温度不同而移动。经计算,CdS颗粒粒径的理论值与其自由激子半径相当,说明吸收边的移动起因于量子限域效应。
Monolithic mesoporous CdS/SiO2 assembly systems were obtained by the sol-gel technique. The characteristic peaks of CdS in Raman spectrum were observed at room temperature. The as-prepared samples were annealed under air and nitrogen, respectively. It is observed that the absorption edge of the CdS/SiO2 shifts in comparison with that of the bulk CdS as the annealing temperature and the loading of CdS in SiO2 change. The calculation results show that the size of CdS particles in the mesoporous SiO2 is equal to its exciton radius. The shift of the absorption edge is attributed to the quantum size effect.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2003年第2期47-52,共6页
Acta Materiae Compositae Sinica
基金
安徽省教育厅自然科学研究项目(批准号:2001kj201ZC)
