Synthesis and Characterization of ZnO Nanocrystal Composites with High Surface Area Supported on Silica-Alumina Matrix by Sol-gel

Authors

• A. Heidary
• M. Jafari
• A. S.Teluri

Abstract

In this paper, the microstructural characteristics of ternary ceramic powders Al2O3-SiO2-ZnO system prepared by sol-gel method, in order to increase surface area of ZnO nanocrystals supported on silica-alumina matrix, have been studied. Values of 20, 50 and 70 weight percents of zinc oxide with an equal weight ratio of SiO2-Al2O3, using simultaneous reaction of zinc nitrate (Zn(NO₃)₂.6H₂O), tetraethyl orthosilicate, (TEOS) and aluminum nitrate(Al(NO3)₃.9H₂O) were synthesized. The nanostructure of prepared composites were characterized by X-ray diffraction, SEM/EDS and BET studies. The results showed that crystaline phase zinc oxide has been formed in amorphous silica-alumina matrix, which led to reducing zinc oxide particles size, preventaing of aglomeration and increasing specific surface.

Keywords

• ZnO
• SiO2 -Al2O3
• composite
• Nanocrystaline
• Sol-Gel

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