纳米ITO粉末制备工艺优化设计

Optimized Design for Preparing Nanocrystalline ITO Powder

摘要:

研究采用均相共沉淀法制备纳米ITO（Indium Tin Oxide）粉末的制备工艺参数,从碱式溶度积平衡和酸式溶度积平衡,根据热力学平衡理论并引入化学反应热容参数分别计算了ITO前驱物In（OH）3和Sn（OH）4开始沉淀和沉淀完全的pH值以及其开始溶解和溶解完全的pH值,给出了这些pH值随沉淀温度的变化规律,由此对工艺参数进行了优化设计并提供了一种有效的材料掺杂新工艺.采用高分辨率透射电镜,扫描电镜,X射线衍射对ITO纳米粉末进行了测量.结果表明,ITO粉末的平均晶粒大小为28 nm,而且沿（400）面生长.

Abstract:

Technologic parameters of preparing nanocrystalline ITO(Indium Tin Oxide) powders by a hydroxide coprecipitation method were studied in this paper. The pH values of deposition beginning and its complete ending in the alkalescent solutions, and the pH values of dissolving beginning and its complete dissolving in the acidic solutions were computed, respectively, by using the equilibrium theory of thermodynamics. It is found that the pH values are functions of temperature. Thereout, the optimized designs of technologic parameters for manufacturing ITO powder have been made. HTEM, SEM, XRD have been used for measuring the nanosized ITO powders and found that the mean size is about 28 nm and grows along the crystal face (400).