Transparent, Adherent, and Photocatalytic SiO2-TiO2 Coatings on Polycarbonate for Self-Cleaning Applications
Transparent, Adherent, and Photocatalytic SiO2-TiO2 Coatings on Polycarbonate for Self-Cleaning Applications
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DOI：
10.3390/coatings4030497
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发表时间：
2014-09-01
期刊：
影响因子：
3.4
通讯作者：
Fujishima, Akira
中科院分区：
文献类型：
--
作者：
Latthe, Sanjay S.;Liu, Shanhu;Fujishima, Akira
光催化TiO2涂层以其优异的自清洁性能而闻名，在超亲水表面形成的非常薄的水层可以在流动时轻松洗掉污垢颗粒。在这里，我们报道了在聚碳酸酯（PC）基材上制备光学透明，粘附，高度可湿性和光催化的二氧化钛涂层，用于自清洁应用。在uv处理的PC基材上涂上二氧化硅阻挡层，然后进行二氧化硅- tio2涂层的自旋涂覆。研究了不同SiO2含量对TiO2表面形貌、机械稳定性、润湿性和光催化性能的影响。与SiO2含量较高的TiO2相比，SiO2含量为7vol %的TiO2制备的涂层表面光滑，无裂纹，表面粗糙度低。紫外线照射30分钟后，涂层上的水滴接触角小于10度。在TiO2中SiO2含量为7 ~ 20时，制备的涂层在可见光范围内具有较高的透明度。
Photocatalytic TiO2 coatings are famously known for their excellent self-cleaning behavior, where very thin water layer formed on the superhydrophilic surface can easily wash-off the dirt particles while flowing. Here we report the preparation of the optically transparent, adherent, highly wettable towards water and photocatalytic SiO2-TiO2 coatings on polycarbonate (PC) substrate for self-cleaning applications. The silica barrier layer was applied on UV-treated PC substrate before spin coating the SiO2-TiO2 coatings. The effect of different vol% of SiO2 in TiO2 and its influence on the surface morphology, mechanical stability, wettability, and photocatalytic properties of the coatings were studied in detail. The coatings prepared from 7 vol% of SiO2 in TiO2 showed smooth, crack-free surface morphology and low surface roughness compared to the coatings prepared from the higher vol% of SiO2 in TiO2. The water drops on this coating acquires a contact angle less than 10 degrees after UV irradiation for 30 min. All the coatings prepared from different vol% (7 to 20) of SiO2 in TiO2 showed high transparency in the visible range.