摘要
本文用溶胶-凝胶法制备均匀透明的TiO2薄膜,在400℃锻烧2 h,再在一定浓度的醋酸中浸泡处理24 h,最后在300℃、400℃、500℃进行第二次热处理0.5 h。用X射线衍射、原子力显微镜、紫外-可见分光光度计表征了处理前后薄膜的晶相结构、表面形貌及薄膜的光学性能。研究了醋酸的浓度、避光时间及光照时间对薄膜亲水性的影响。实验表明:用醋酸浸泡处理后的薄膜亲水性明显提高。光谱及AFM分析表明,导致TiO2薄膜亲水性改善的原因是醋酸浸泡处理后的薄膜表面结构的发生了变化。醋酸的最佳浓度为1 mol/L。
The uniform transparent TiO2 nanometer thin film was prepared with sol-gel method at 400℃ for 2 h. The as-calcined TiO2 nanometer thin film was treated in different CH3 COOH aqueous solution for 24 h. Finally, the treated TiO2 thin film was again heat-treated at 300℃ ,400℃ ,500℃ for 0. 5 h respectively. The structure and hydrophilicity of TiO2 thin film before and after surface acid treatment was characterized by XRD, AFM, UV-vis, contact-angle measurement. Studied the effects of CH3COOH concentration ,lucifuge time and illumination time on the hydrophilicity of TiO2 thin films, the results show that hydrophilicity of treated TiO2 thin film was effectively enhanced. The analysis of ultraviolet absorption and AFM show that the hydrophilicity of TiO2 thin film depends strongly on the change of surface microstructure. The CH3COOH optimum concentration is 1 mol/L.
