Microwave-induced combustion synthesis of nanocrystalline TiO2-SiO2 binary oxide material

作者：Ganesh I^*; Johnson R; Mahajan YR; Khan A; Madhavendra SS; Reddy BM

来源：Journal of Materials Research, 2004, 19(4): 1015-1023.

DOI：10.1557/JMR.2004.0132

A nanocrystalline titania-silica (1:1 molar ratio) binary oxide material was synthesized by microwave-induced combustion process in a modified domestic microwave oven (operated at 2.45 GHz frequency and 700 W power) in approximately 60 min from in situ synthesized titanyl nitrate and siliconyl nitrate using urea as fuel. For the sake of comparison, two different types of TiO2-SiO2 powders were also synthesized by the sol-gel and the co-precipitation methods. All the synthesized powders were characterized with the help of thermogravimetriy/differential thermal analysis, x-ray diffraction, transmission electron microscopy (TEM), and Brunauer-Emmett-Teller surface area measurements and the results compared. The as-synthesized TiO2-SiO2 powder obtained by the combustion process showed an average crystallite size of 10 nm and the specific surface area of 115 m(2)g(-1). Among the three differently synthesized TiO2-SiO2 powders, only the microwave-induced combustion synthesis yielded crystalline material. TEM in particular confirmed the presence of nano-sized particles in the microwave-induced combustion-synthesized powder. Among the three analogies, microwave synthesis was found to be superior in terms of ease of processing leading to tithe and power savings.

• 出版日期2004-4