采用sol-gel法制备纳晶TiO2薄膜,在溶胶的制备过程中加入丙烯酸对纳米TiO2胶体颗粒进行表面修饰.溶胶的透射电镜(TEM)分析表明,丙烯酸的表面修饰作用可以抑制在制备和陈放过程中胶体颗粒的团聚.采用原位程序升温,使用X射线衍射仪(XRD)对TiO2粉体由锐钛矿向金红石的转变过程(A→R)进行了考察,结果显示,晶粒的迅速生长和晶型的转变有着密切的联系;此外,丙烯酸的修饰作用能显著提高A→R的温度,且有助于抑制热处理过程中纳晶TiO2颗粒的团聚.TiO2薄膜的原子力显微照片(AFM)表明,丙烯酸修饰法制备的TiO2薄膜,膜层均匀连续,颗粒为纳米尺度.
TiO2 thin film photocatalyst was prepared by the sol-gel method with acrylic acid acted as the surface modifier. The TEM images showed that the aggregation of TiO2 particles in the sol could be remarkably inhibited due to the modification of acrylic acid. The result of XRD and AFM analysis indicated that rapid grain growth of Nano- TiO2 particles could be suppressed also by the modification in thermal treatments and the transformation temperature of anatase to rutile (A→R) was extended into more high range of 800-1000℃ compared with the unmodified TiO2
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