摘要：为了解决传统SnO₂厚膜半导体元件使用中尤其在高温时易断裂的问题,利用液相均匀包覆法在天然纤蛇纹石纳米管表面包覆Sn(OH)₂纳米粒子,经处理得到SnO₂-纤蛇纹石纳米复合材料,采用zeta电位仪、X射线衍射仪、原子力显微镜、透射电子显微镜研究样品的电性、结构与形貌特征。结果表明:酸性溶液中纤蛇纹石表层的氢氧镁石八面体层被溶蚀,裸露出因Al³⁺取代Si⁴⁺而带负电荷的硅氧四面体层,可吸附带正电的Sn(OH)₂胶粒,依此原理成功制备了SnO_2-纤蛇纹石纳米复合材料,纤维表面SnO₂纳米颗粒包覆层均匀、致密;当控制反应溶液pH约为2.5时,Sn²⁺水解速度较合适,有利于SnO₂纳米粒子在纤蛇纹石表面的包覆。

关键词：氧化锡；纤蛇纹石；液相均匀包覆法；复合材料

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