Abstract:
Monolithic mesoporous CdS/SiO
2 assembly systems were obtained by 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/SiO
2 shifts in comparison with that of the bulk CdS as the annealing temperature change as well as the loading of CdS in SiO
2. The calculating result showed that the size of CdS particles in the mesoporous SiO
2 is similar to its exciton radius on quantity. The shift of the absorption edge was attributed to the quantum size effect.