| The microstructures of TiO2 thin film, such as the particle size,specific surface area etc, are important to its properties such as the photocatalysis property, photoel ectric transformation efficiency, conductivity and so on. As we all known, sol-gel m ethod is an effective way to prepare TiO2 thin film. Microstructure of TiO2 thin fil m is closely relevant with the microstructure of colloidal sol. In this paper, effects of solvent and addition agent on the microstructures of TiO2 thin film were studied.First of all, effects of solvent on microstructure of porous TiO2 films were stu died. Glycol monomethyl ether, propylene glycol monomethyl ether, ethanol, and eth yleneglycol monophenylether were used as solvents. The film prepared with glycol monomethyl ether was of uniform big pores. The infrared spectrum of different coll oidal sols were measured.The graphs showed that the intensity of 3200-3550nm wid e peaks were different. The wide peak is corresponding to hydroxyl group. The int ensity of wide peaks of colloidal sols prepared with propylene glycol monomethyl e ther, ethanol were rather low. The intensity prepared with glycol monomethyl ether was strong. While the intensity prepared with half glycol monomethyl ether and hal f ethanol was stronger. It seemed that the size of colloidal particle prepared with gl ycol monomethyl ether was the exact size for HPC and Ti-O-Ti-O-Ti network confi guration to link together perfectly. After heat processing, HPC disappeared and unif orm big porous film was produced.Ag metal particle/TiO2 compound thin film was derived from sol-gel method. Effect of addition agent on the microstructure and properties of colloidal sols and t hin film was studied.Diethanolamine(DEA) and acetylacetone(AcAc) were selected as addition agents.Stable Ag colloid was formed when DEA was added. And Ag colloidal particles were well dispersed in the network configuartion of TiO2 colloidal particle. In the compound thin film, Ag metal particles were dispersed uniformly in most areas. Smallzones where Ag metal particle conglobated were observed too. Most Ag metal particle size were in the range of 10-40nm.When the AgNO3 dopant amount was 18%,most Ag metal particles were in the range of 2-10nm. In the experiment, sols were transparent even when the AgNO3 dopant amount was 18%.When Acetylacetone(AcAc) was selected as addition agent,there were a few Ag metal particles distributing non-uniformly in the T1O2 thin film. Ag colloid was unstable, when AcAc was addedDEA has strong completing action on Ag+. Stable Ag colloid was formed. Ag metal particles were dispersed uniformly in most areas. When AcAc was used as the addition agent, completing action is weak. Ag colloid was unstable. Ag metal particle dispersed non-uniformly in the T1O2 thin film.
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