Study On Preparation Of Nano-sized Antimony Tin Oxide Powder And Stability Of Conductive Slurry

Antimony-doped tin oxide (ATO) materials find a wide application in displays, shell of appliances, gas sensors, photoelectric conversion of solar energy. At present a sputter technique is usually employed in preparing ATO film materials, but this method need the expensive sputter equipments and special target. For these reasons a new prepared route as following is adopted in this thesis: ATO nano-sized powder→ ATO slurry→ATO nano-sized coatings. The obtaining of nano-sized powder is in a condition to reduce sinter temperature of the coatings and prepare the stability slurry, then a coatings was coated in a substrate by spining method. The chief contents and results of the study are as follows:1. ATO nano-sized powder was prepared by the method of alkoxides hydrolysis and the effect of technology parameters such as: reflux time, hydrolysis temperature, hydrolysis pH, calcination temperature and dispersants on microstructure of powder was investigated in detail. To improve monodispersity of the powders, the effect of ultrasonic hydrolysis, azeotropic distillation of hydrolysis product and solvothermal treatment of the powders on monodispersity of ATO nano-sized powder were studied, the processing parameters were optimized. The optimum doped amount of Sb in ATO materials was theoretically calculated and experimentally determined, the variation of valence state of Sb with doping Sb content was investigated, the relation of semiconducting mechanism and conductive property of the materials was found out. the effect of Sb codoped with second element on electrical and optical property of coatings was studied. ATO slurry was prepared by enhancement dispersing and processing parameters were optimized.2. The preparing of ATO nano-sized powder was investigated and technology parameters were optimized. The alkoxides hydrolysis method was adopted in preparing of ATO nano-sized powder, a new solvothermal treatment was studied to improve monodispersity of ATO nano-sized powder, a satisfactory results was obtained. The optimized technology parameters were as following; reflux time 16h, reflux temperature 78-80℃, hydrolysis pH value 3, calcination temperature 600℃ sustained time 2h, temperature of solvothermal treatment 250℃. The average particles diameter of ATO nano-sized powder was 10nm, the shape of particles was ellipsoidal, the specific surface area of nano-sized powder examined by nitrogen...