The Properties Of Antimony Doped Tin Oxide Composite Materials

Antimony doped tin oxide?ATO? nano-powder are widely used in electrically induced color changing function conversion film, flat-panel displays, solar cells, gas sensor due to its excellent electric conductivity, good optical properties, perfect thermal stability and corrosion resistance. Besides, ATO powder has a broad market prospect. What's more, composite conductive powder has the advantages of nuclear bodies and ATO powder. As a filler in the application the composite conductive powder can reduce the dosage of overall ATO, which can reduce the cost in the large-scale industrial production.This paper mainly studied the preparation method, conductive mechanism of Sb doped SnO₂ and the composite conductive powder which coated with ATO powder. In this paper, antinomy doped tin oxide and the composite conductive powder using stannic chloride crystallization and antimony trichloride as the main raw material were prepared by hydrothermal method and co-precipitation method respectively. The conductivity of these powders was studied by using electrochemical workstation. What's more, the X-ray diffraction?XRD?, field emission scanning electron microscope?SEM?, energy spectrum analysis?EDS?, Fourier spectrum?FTIR? were used to study the structure and morphology of doped SnO₂ and un-doped. And this paper also studied the relationship between the conductive performance and the structure.The effects of technological parameters, such as the Sb doping amount, hydrothermal temperature and the calcination temperature, on the conductive property of ATO powder were analysed. Besides, the optimum technological parameters were given as follows: Sb doping amount to 5%, hydrothermal at 180°C for 2h and calcinated at 900°C for 2h. The electrical resistivity of ATO is 2.5 x 103 ?·cm, and the average particle size of ATO particles is 60.9 nm.The ATO coated TiO₂?SST? composite conductive materials were synthesized by co-precipitation method. The influences of pH, Sn/Ti mole ratio, hydrolysis temperature and calcination temperature on the electrical resistivity and the morphology of the SST powders were studied. Under the optimum experimental conditions, 0.5 Sn/Ti mole ratio, pH 2, hydrolysis at 70°C and calcinated at 500°C, the electrical resistivity of the composite conductive powders is 2.546×103 ?·cm. The SST powders exhibited the core-shell structure, and the grain size of ATO particles on the surface of TiO₂ is 25 nm.The ATO composite coating materials with the hollow microspheres as the basis materials were synthesized by co-precipitation method. The influences of SnO₂/HGS mass ratio and calcination temperature on the electrical resistivity and the morphology of the SSH powders were studied. And the coating mechanism of ATO on the surface of microspheres particles was also discussed. ATO particles coated on the surface of microspheres evenly, and the coating thickness is about 100 nm.