摘 要: 为了掌握沉淀反应包覆掺锑氧化锡膜形态和工艺参数对导电 粉电阻率的影响规律, 本文中详细研究了采用沉淀法在氧化钛表面包 覆掺锑氧化锡的过程。通过采用透射电镜观察包覆产物结构, 并对不 同 pH 值下的包覆产物进行了光电子能谱分析。结合氧化钛和氧化锡 水溶液的 Zeta 电位, 提出了包覆过程和模型。结果表明: 包覆过程是 先均相形核, 然后锡溶胶靠静电引力与范德华力共同作用吸附在氧化 钛表面; 当沉淀 pH=2 时, 氧化锡以直径为 5nm 胶粒单层密排在氧化 钛表面, 此时导电粉具有最佳导电性。 

关键词: 导电粉; 掺锑氧化锡; 包覆

Abstract: The white conductive powder was prepared by co-precipita tion method, using SnCl₄·5H₂O, SbCl₃ and ultra-fine TiO₂ powder as precursors. XPS and TEM were applied to characterize the contents and structure of the materials obtained under different pH condition. The mechanism of forming antimoy tin oxide(ATO) coating on TiO₂ was sys tematically investigated. The mechanism of formation of coating was suggested as xSn(Sb)O₂·yH2O were formed as colloidal particles, then ad sorbed on TiO₂ surface by Van de Waals force and electric force. When co-precipitated under pH=2, single layer of ATO particles of 5 nm in di ameter were arrayed on surface of TiO₂. The conductive powders ob tained under pH=2 has best conductivity. 

Keywords: conductive powders; antimony tin oxide; coating