Abstract:SnO₂ powder was prepared by chemical precipitation method. Effects of starting materials concentration, pH value of final system and treating temperature on the particle size were investigated by means of X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The parameters of chemical precipitation were optimized. It is concluded that the concentration of starting material and pH value of final system has little effect on the SnO₂ particle size, but heat treatment do greatly affect the particle size. If the treating temperature is lower than 500℃, the particle size has a good stability; otherwise, the particle size remarkably increases with increasing temperature. The dispersing agents have various influences on SnO₂ powder as the polarity of dispersing agents changed.

Key words:  SnO₂; nano-sized; chemical precipitation method; particle size