【摘要】 目的制备纳米TiO2薄膜并研究涂膜层数与催化性能的关系.方法采用溶胶凝胶法并利用提拉技术制备纳米TiO2薄膜.应用朗伯-比尔定律分析其光催化活性,利用金相显微镜观察单层和多层薄膜的表面形貌,用红外光谱和XRD分析所制备薄膜材料的结构,利用甲基橙溶液研究该薄膜的光催化性能.结果溶胶凝胶法在500℃的热处理温度制备了结晶良好的锐钛矿相结构的纳米TiO2薄膜材料,晶粒尺寸为40~80 nm;控制提拉速度和加入乙酰丙酮,能使薄膜的缺陷减少;涂膜层数为5层时光催化性能比1层到4层时好,这是由于5层时薄膜表面更均匀、更致密,但是层数增加也使薄膜的内应力增加,致使表面产生裂纹.结论涂膜层数增加均使TiO2光催化性能得到提高,镀膜层数较少时,膜层较好,5层镀膜时膜层产生了裂纹.更多还原

【Abstract】 TiO2 sol was prepared by sol-gel method.The nano-TiO2 film was plated on the surface of quartz glass by Czochralski technique.Then it was sintered at 500℃.The photocatalytic activity of the films was analyzed by Lambert-Beer’s law.The morphology,crystal structure and stable crystal phase of TiO2 films were confirmed by Metallography Microscope and X-ray Diffraction measurement and FTIR spectroscopy.The results showed that the nano-TiO2 was anatase and the size of the grain was 40-80nm;the thickness of the films and the ageing time had an important effect on the photocatalytic activity of the films;the thicker is the film,the greater is the photocatalytic activity of the films;the layers of the nano-TiO2 film were less,the film was more ideal.There was crack when the layers of the film were more than five.更多还原