Ultrafine Of Tio <sub> 2 </ Sub> Preparation And Electrical Properties Of The Conductive Powder Study

conductive power, a kind of functional material, was often used in macromolecular material as conductive stuffing. Compared with traditional conductive power such as carbonic powder and metallic power, it has a slight coloration, stable conductivity and strongly capability of cauterization-resistant. It has a promising application in the future.In this paper, the conductive power of TiO2 that was coated by Sb-doped SnO2 was prepared by wet chemical method with the raw material SnCl4.5H2O and SbCl3. And the powder was characterized by SEM, TG-DSC, BET, XRD, XPS et al. The effects of the thickness of conductive thin film, Sb doping level, heating treatment temperature were systematically investigated. And the thickness of conductive film that was preparation with different proportion of chemical reaction was worked out by Weight Increase Method.The results of our research showed the following. The preparation technique studied in this paper could be used to produce excellent conductive TiO2 powder. The resistance rate of the powder was less than 100.cm. The doped Sb atoms became solute in the lattice of SnO2 phases by substitution and provide free electrons that could increase the concentration of conductive carriers when the doping concentration of Sb was below the critical value. The scale of SnO2/TiO2 determined the formation of even and continuous conductive film. And the even and continuous conductive film was the precondition to guarantee the smooth movement of conductive carriers that would meet the least resistance in the course of transfer. Study showed that the proper scale of SnO2/TiO2 was 0.25. The heating temperature was mainly effect on the degree of crystallization in SnO2. The crystal of SnO2 was becoming perfect when the heating temperature was between 150-900C, but the chemical state of Sb occurred after the temperature was above 500C. Experiment showed that the transformation of Sb from Sb3+ to Sb5+ was useful to reduce the resistance rate of powder when the temperature was below 500C and the conductivity of powder would become worse with the transformation of Sb from Sb5+to Sb3+ after the temperature was above 500C. So the proper heating temperature was 500C.