关键词: 纳米粉体, 铟锡氧化物, 共沉淀法, 前驱体

Abstract: Indium tin oxide (ITO) nanopowder was synthesized by liquid chemical co-precipitation process using 4 N indium and tin ingots as material and ammonia (25% wt) as precipitator. The study investigated the effect of the initial concentration of indium ion，reaction temperature, pH of reaction end and aging time of precursor on the size of ITO powder. The powder was characterized by means of X-ray diffraction (XRD), differential thermal analysis, thermogravimetric analysis (DTA-TG), transmission electron microscopy (TEM) and field-emission scanning electron microscope(SEM). At 1% sodium silicate, a reaction temperature of 60 ℃, a final reaction pH of 8, an aging time of 2 h and a calcination temperature of 800 ℃ for 4 h, the ITO powder particulates obtained are of cubic crystalline structure, 20～40 nm sized, spherical, uniform and well dispersed. Compared with the previous ones, this process has the advantages of easy-to-get raw material, improved co-precipitation, moderate reaction, simple process equipment, small pollution, low cost and high quality, providing a new process route for the synthesis of nanosized ITO powder.

Key words: Nonosized powder, Indium and tin oxide (ITO), Coprecipitation, Precursor