Chemical Precipitation Synthesis and Optical Properties of ZnO/SiO₂ Nanocomposites

Abstract

SiO 2 nanowires, made from natural chrysotile, were used to synthesize zinc oxide (ZnO)/SiO 2 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 o20 nm, and the leached SiO 2 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 SiO 2 nanowires. The photoluminescence spectra showed that ZnO/SiO 2 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/SiO 2 composites can be used as photocatalysts for waste water treatment because they separate much more easily away from solution.

SiO2/ZnO Composite Hollow Sub-Micron Fibers: Fabrication from Facile Single Capillary Electrospinning and Their Photoluminescence Properties

“…The enhancement of the blue emission intensity might originate from two factors. On the one hand, the radiative recombination of trapped electron from shallow donor levels created by various oxygen vacancies in the valence band of ZnO may lead to the blue emission [ 31 , 32 , 33 ]. On the other hand, it might be due to the interface defect of ZnO and SiO 2 [ 33 , 34 , 35 ].…”

Concentration of whey protein from cheese whey effluent using ultrafiltration by combination of hydrophilic metal oxides and hydrophobic polymer

“…Nano ZnO was synthesized by the chemical precipitation method using the protocol followed by Yang et al . Initially, 200 ml of 0.07 mol L –1 of zinc acetate solution was prepared using double‐distilled water.…”

“…Nano ZnO was synthesized by the chemical precipitation method using the protocol followed by Yang et al. 20 Initially, 200 ml of 0.07 mol L -1 of zinc acetate solution was prepared using double-distilled water. Then, 0.3 mol L -1 NaOH solution was added in drops into the zinc acetate solution until the pH reached 8.…”

Effect of nanoclay and ZnO on the physical and chemical properties of wood polymer nanocomposite

“…ZnO enhances the thermal, mechanical, UV resistance, as well as other relevant properties of the composite 8–10. Polymer‐ZnO composites have been explored as technological important due to their potential applications in solar cells, electrochromic windows, optical device, gas sensing, and in antimicrobial application of food preservation 11–14. Reports based on wood/polymer/clay nanocomposite are available in literature.…”