【摘要】 采用Zeta电位测定手段研究了ATO(Sb掺杂SnO2)包覆TiO2粉体的包覆机理,用XRD、TEM、XPS和LCR数字电桥等对包覆粉体的物相、形态、表面元素组成及其导电性能测试分析加以佐证,并建立了相应的包覆模型.结果表明,ATO包覆TiO2粉体的机理是色散吸引力和粒子间的静电力共同作用的结果,当pH=2时ATO与TiO2与Zeta电位产生的协同静电作用最佳,与XRD、TEM、XPS和LCR数字电桥等实验分析的结果相一致,由包覆模型计算的单层最大包覆量15%的结论与试验的包覆粉体电阻率转折临界点吻合.更多还原

【Abstract】 TiO2 powder served as the core,SnCl4·5H2O and SbCl3 as precursor,TiO2 powder coated with ATO(Sb doped SnO2) was prepared by hydrolysis-coprecipitation method.XRD,TEM,XPS,Zeta potential and LCR digital bridge were employed to analyze the coated powder in terms of phase,morphology,surface element composition,conductivity as well as coating mechanism.A coating model was build according to the TEM photographs.The results show that Sb can efficiently be doped into SnO2 lattice and ATO combine with TiO2 by particle diameters from 4nm to 8nm.The optimum surface element composition of the obtained powder is n(Ti)∶n(Sn)∶ n(Sb)=8.15∶80.04∶11.81.The coating mechanism is concluded to be the joint effects of the dispersive force and,the electrostatic between ATO and TiO2 particle,which is confirmed by the optimum Zeta potential when pH value is 2.The biggest coating quantity of single layer calculating through the established coating model agrees with the critical point of resistivity of the coated powder.更多还原