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

Subject Areas : journal of New Materials

A. Heidary ¹ , M. Jafari ² , A. S.Teluri ³

1 - دانشجوی کارشناسی ارشد، دانشگاه آزاد اسلامی، واحد نجف آباد، دانشکده مهندسی مواد، نجف آباد ایران.
2 - عضو هیئت علمی، دانشگاه آزاد اسلامی، واحد نجف آباد، دانشکده مهندسی مواد، نجف آباد ایران.
3 - عضو هیئت علمی، دانشگاه آزاد اسلامی، واحد نجف آباد، دانشکده مهندسی مواد، نجف آباد ایران.

Received: 2013-09-16 Accepted : 2013-09-16 Published : 2013-09-23

Keywords: ZnO, SiO2 -Al2O3, composite, Nanocrystaline, Sol-Gel,

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.

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