Chemical Precipitation Synthesis and Optical Properties of ZnO/SiO2 Nanocomposites
SiO2 nanowires, made from natural chrysotile, were used to synthesize zinc oxide (ZnO)/SiO2 composites by chemical precipitation. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy, and Fourier transform infrared. Their optical properties were studied by a ultraviolet-vis spectrophotometer and a fluorescence spectrophotometer. Structural analysis revealed that the crystal size of ZnO crystallites is <20 nm, and the leached SiO2 nanowires were amorphous. TEM analysis showed that the size of ZnO particles in SZ8 was mainly in the range from 15 to 20 nm and dispersed uniformly on the surface of SiO2 nanowires. The photoluminescence spectra showed that ZnO/SiO2 composites have stronger emitting intensity at the blue–green band than pure ZnO synthesized under the same reaction conditions. Therefore, the composites will be of great interest in the application of luminescence material. The as-prepared ZnO/SiO2 composites can be used as photocatalysts for waste water treatment because they separate much more easily away from solution.
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Document Type: Research Article
Affiliations: Department of Inorganic Materials, School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China
Publication date: May 1, 2008