Preparation of silver tin oxide powders by hydrothermal reduction and crystallization

Abstract

Silver tin oxide composite powders were synthesized by the hydrothermal method with a silver ammine solution and a Na 2SnO 3 solution as raw materials. H 2C 2O 4 was used as the co-precipitator of silver ions and tin ions. The co-precipitation conditions were investigated. The results show that the co-precipitate of Ag 2C 2C 4 and Sn(OH) 4 is available when the pH value of the solution is 4.27–8.36. Using the obtained precipitate as precursor, the reduction of Ag + and the crystallization of tin oxide were carried out simultaneously by the hydrothermal method and silver tin oxide composite powders were obtained. The composite powders were characterized by X-ray diffraction (XRD) analysis, scanning electron microscope (SEM), and energy spectrum analysis. The results show that the silver tin oxide composite powders are small with a diameter of about 2 μm and with homogeneous distribution of tin.