具有自洁和耐磨功能SiO_2/TiO_2减反膜的制备与研究

Preparation and Investigation of SiO_2/TiO_2 Antireflective Coatings with Self-cleaning and Scratch-resistant Properties

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）,ellip-someter and contact angle measurement.The self-cleaning function of coatings was evaluated by means of photo-catalytic degradation of methyl orange in aqueous solution,and scratch-resistant property of the coatings was stud-ied.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 or-ange can be degraded by 43.6% in 2h.Moreover,the SiO2/TiO2 bilayer coating has an excellent scratch-resistant property.