Sol gel derived photocatalytic porous TiO2 thin films
Sol gel derived photocatalytic porous TiO2 thin films
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DOI：
10.1016/j.surfcoat.2004.10.055
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发表时间：
2005-08
影响因子：
5.4
通讯作者：
B. Guo;Zhaolin Liu;L. Hong;Huixin Jiang
中科院分区：
文献类型：
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作者：
B. Guo;Zhaolin Liu;L. Hong;Huixin Jiang
以钛醇盐为前驱体，采用溶胶-凝胶法在玻璃基片上旋涂制备了透明多孔TiO 2薄膜。将不同分子量的聚乙二醇（PEG）作为结构导向剂加入到涂层溶液中，制得透明、无裂纹、纳米多孔的薄膜。采用场发射扫描电子显微镜（FEG-SEM）观察薄膜的表面形貌，X射线衍射（XRD）表征薄膜的晶体结构，并对薄膜的光催化活性进行评价。所有的膜都是亲水性的。与未添加聚合物的TiO 2膜相比，PEG在高温处理过程中的分解被认为是导致膜中多孔结构的产生的原因，并且较高的分子量导致较大的孔径和比表面积。XRD分析表明，在550 °C时，所有的TiO 2薄膜都具有TiO 2纳米晶结构的特征衍射峰。以甲基橙橙子为目标降解物，研究了PEG分子量对TiO 2薄膜光催化活性的影响。
Transparent porous TiO2thin film was spin-coated on glass substrates from a sol gel solution containing titanium alkoxide as precursor. Polyethylene glycol (PEG), with different molecular weight, was added to the coating solution as a structure-directing agent, and the films thus prepared were transparent, crack free and nanoporous. The surface morphology of the films has been observed by field emission gun-scanning electron microscope (FEG-SEM), the crystal structure characterized by X-ray diffraction (XRD) and the photocatalytic activity of the TiO2thin films evaluated. All the films are hydrophilic. The decomposition of PEG during high temperature treating is considered to be responsible for the generation of porous structure in the films as compared with TiO2film without addition of the polymer, and higher molecular weight leads to larger pore size and specific surface area. XRD shows that all TiO2films display the characteristic diffraction peaks of a TiO2anatase structure at 550 °C. The photocatalytic activity of the TiO2thin films as evaluated by the decomposition of methyl orange was increased with the PEG molecular weight increased.