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Preparation and Properties of Sr~(2+)-doped Nano TiO_2 Thin Film

Ding,Shiwen Gao,Jia Ding,Yu(College of Chemistry and Environmental Science,Hebei University,Baoding 071002)  
Sr2+-doped nano TiO2 colorless and transparent hydrosol with an average particle size of 6 nm was synthesized by a novel complexation-controlled hydrolysis method at room temperature by using TiCl4,organic carboxylic acid,NH3oH2O,Sr(OH)2o8H2O,and D-sorbitol etc.as raw materials.Subsequently,the nanoscaled thin films were prepared by ordinary spraying technology.The phase structure,composition,particle size,absorbance spectrum,and contact angle of samples were characterized by XRD,nano laser particle size analyzer,AFM,EDS,ultraviolet-visible spectrophotometer,and optical contact angle tester,respectively.In addition,the influence of reaction conditions in the synthesis process was also studied.The nanoscaled thin films prepared by Sr2+-doped nano TiO2 hydrosol exhibit optimal photocatalytic performance when the doping content of Sr2+and refluxing time are 1.8% and 60 min,respectively.The degradation efficiency of acid red 3R dye solution with concentration 50 mg/L has reached 99% after exposed to sunlight for 60 min.Furthermore,the contact angle of the thin film sample is 0.91 degree,indicating the superhydrophilic property of the sample.
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