以正硅酸乙酯(TEOS)和钛酸正丁酯(TBOT)为原料, 采用溶胶-凝胶法制备了SiO2溶胶和TiO2溶胶, 利用浸渍提拉法制备了SiO2/TiO2双层减反膜. 用紫外-可见分光光度计(UV-Vis)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)、原子力显微镜(AFM)、椭圆偏振光谱仪和接触角测量仪等分析表征了薄膜的特性, 以光催化降解甲基橙溶液实验来评价薄膜的自洁功能, 考察了SiO2/TiO2双层减反膜的耐磨擦性. 结果表明, SiO2/TiO2双层减反膜在400~800nm可见光波段的透光率最高可达97.2%, 薄膜表面平整, 结构致密且粗糙度小, 经紫外灯照射后薄膜的水接触角接近0°, 光催化2h后可将5mg/L的甲基橙溶液降解43.6%. SiO2/TiO2减反膜还具有优良的耐磨擦性能.
The SiO2 and TiO2 Sol were prepared via Sol-Gel process using tetraethyl orthosilicate(TEOS) and tetrabutyl orthotitanate(TBOT), and the SiO2/TiO2 bilayer coatings with antireflection property were obtained by dip-coating method. The performances of the coatings were analyzed with ultraviolet visible spectrophotometer (UV-Vis), X-ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscope (AFM), ellipsometer and contact angle measurement. The self-cleaning function of coatings was evaluated by means of photocatalytic degradation of methyl orange in aqueous solution, and scratch-resistant property of the coatings was studied. The results indicate that the peak transmission of the SiO2/TiO2 bilayer coating is up to 97.2% in the visible band, the coating has a flat surface, a dense structure and a low roughness. After illuminated by ultraviolet light for 2h, the SiO2/TiO2 bilayer coating is superhydrophilic with water contact angle up to 0°, and the 5mg/L methyl orange can be degraded by 43.6% in 2h. Moreover, the SiO2/TiO2 bilayer coating has an excellent scratch-resistant property.
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