Abstract： To solve the problem that conventional SnO₂ thick semiconductor films usually break or shed in use especially working at high temperature for some time, Sn(OH)₂-chrysotile composite materials were prepared by the liquid phase coating method. SnO₂-chrysotile nano-composite materials were obtained after a series of treatments. Zeta potential analyzer, XRD, AFM and TEM were used to characterize electrical property, structure and morphology of the samples. The results show that the brucite octahedrons of chrysotile can be dissolved in acidic liquid, remaining negatively charged [SiO₄] tetrahedrons due to the replacement of Si⁴⁺ by Al³⁺. The [SiO₄] sheets can adsorb positive charged Sn（OH）₂ colloidal particles, so SnO₂-chrysotile nano-composite materials can be prepared successfully. The coated layers made of SnO₂nano-particles are dense and well-proportioned on the surface of chrysotile fibers. In the process of coating, the rate of hydrolysis for Sn²⁺ is suitable when pH is about 2.5, which helps to make the SnO₂ nano-particles coated on the surface of chrysotile.

Keywords: tin dioxide; chrysotile; liquid phase coating method; composite materials