A Simple Approach to Fabricate CdS-SiO_2 Hybrid Microspheres by Producing CdS Nanoparticles on the Surface of Thiolated SiO_2 Microspheres

摘要

We have developed a simple synthetic method to prepare the hybrid microspheres of CdS nanoparticles on the surface of silica microspheres modified by(3-mercaptopropyl)trimethoxysilane(MPS). The -SH groups of MPS can bind with the Cd~(2+) ions on the surface of SiO_2. When thioacetamide releases H_2S, the nanosized CdS particles (1-6 nm) will successfully be generated on the silica surface under the experimental conditions. The size of the CdS nanoparticles was found to be related to the concentration of Cd~(2+) feed and the size of silica spheres, the higher the concentration of Cd~(2+) and the larger of silica microspheres, the bigger the size of CdS nanoparticles. Techniques including UV, PL, TEM and XPS were used to characterize the CdS-SiO_2 hybrid microspheres.