不同体系水热制备银氧化锡复合粉体的研究

Study on Silver Tin Oxide Composite Powder Preparation by Hydrothermal Method in Different Systems

摘要:

分别采用氨水和柠檬酸作为溶液中银离子的配体，草酸、亚硫酸钠和柠檬酸作为还原剂，水热制备Ag-SnO2复合粉体。对Ag-SnO2复合粉体进行了差热分析、X射线衍射、扫描电镜和元素面扫描分析。结果表明：不同体系均可水热制备银氧化锡复合粉体。在以氨水为配体，分别以亚硫酸钠和草酸为还原剂的体系中，银和二氧化锡沉积完全。以亚硫酸钠为还原剂的体系中所得复合粉体为片状结构，厚度约为300 nm，而以草酸为还原剂所得复合粉体为球形结构，粒径约为100 nm。以柠檬酸为配合剂和还原剂的水热体系中二氧化锡沉积不完全，所得复合粉体为不规则球形，粒径较小，约为30 nm

Abstract:

The silver tin oxide powders were prepared by hydrothermal method using ammonia and citric acid as complex of silver ions, and oxalic acid, sulfuric acid and citric acid as reductant. The Ag-SnO2 composite powders were characterized by differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscopy(SEM) and energy spectrum analysis. The results show that the silver tin oxide composite powders could be synthesized in different hydrothermal systems. In the system with ammonia as complex of silver ions, sodium sulfuric and oxalic acid as reductant, respectively, silver and tin oxide deposit completely. In the system with sodium sulfuric as reductant, the prepared composite powder is mainly flake structure with about 300 nm thickness. While in the system with oxalic acid as reductant, the prepared composite powder is spherical structure with about 100 nm particle size. In the system with citric acid as both complex and reductant, the tin oxide do not deposit completely and the prepared composite powder is irregularly spherical particle with smaller size of about 30 nm