三氧化钨溶胶稳定机理及薄膜结构变化特征探讨

摘要

本文以钨酸钠阳离子树脂酸化法制备三氧化钨溶胶，采用提拉法成膜。并讨论了溶胶稳定和成膜的机理，通过TG-DTA和IR分析探讨了固体薄膜在热处理过程中的结构变化。实验结果表明，双氧水和乙醇与钨酸络合，使溶胶稳定。挥发性强的小分子配体(如乙醇)对成膜有利。TG-DTA和IR分析结果表明，随着热处理温度的提高，薄膜中多聚钨酸离子(或者说氧化钨分子簇)进一步缩合，WO6八面体对称性逐渐增强。%Tungsten trioxide colloidal solutions were prepared by ion-exchange method.WO3 thin films were deposited by dip-coating technique.The mechanisms of stability of the sols and film formations were discussed.The evolutions of the structure of films after heat treatment are discussed by means of TG-DTA and IR analysis.It is indicated that H2O2 and ethanol are coordinated with tungstic acid,which makes sols stable.Volatile Ligands(for example ethanol)are favorable for film formation.It is concluded that ions are condensed gradually in the process of heat treatment polytungstate acid,the symmetry of the WO6 octahedral is improved and the strength of the WOWbond is increased.