化学共沉淀法制备纳米铋掺杂氧化锡

以SnCl4.5H2O和Bi(NO3)3.5H2O为原料,氨水为沉淀剂,采用化学共沉淀法制备了铋掺杂氧化锡(BTO)纳米粉体,考察了反应温度、滴定终点pH、铋掺杂量、煅烧温度和分散剂PEG-600对所得的纳米BTO粉体物相、晶粒度和形貌的影响,对粉末的前驱体进行综合热分析(TG-DTA),用X射线衍射(XRD)、扫描电镜(SEM)对产物的结构和形貌进行表征,得到共沉淀法制备纳米BTO粉体的最佳条件:反应温度60℃,滴定终点pH=3,煅烧温度600℃;该条件下制得BTO粉体的电阻率最小为3.48Ω.cm。

A Study on the Influencing Factors in the Preparation of Bismuth-doped Tin Oxide Nano-powders by Co-Precipitation

Bismuth-doped tin oxide(BTO) nano-particles were prepared by chemical co-precipitation method using SnCl4·5H2O and Bi(NO3)3·5H2O as precursors and NH3·H2O as precipitant.The effect of processing parameters on the particles was investigated.These parameters include reaction temperature,terminal pH,doping bismuth content,calcine temperature,and PEG-600 dispersant.The BTO precursors were studied by means of TG-DTA.The product particles were characterized by means of X-ray diffraction(XRD) and scanning electron microscopy(SEM).The optimized conditions for preparing nanometer BTO powders were proposed:reaction temperature of 60 ℃,terminal pH of 3,and the calcine temperature of 600 ℃,the minimum resistivity of BTO powders is 3.48 Ω·cm under the optimized conditions.