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首页> 外文期刊>Applied Surface Science >Deposition of graded TiO2 films featured both hydrophobic and photo-induced hydrophilic properties
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Deposition of graded TiO2 films featured both hydrophobic and photo-induced hydrophilic properties

机译：渐变TiO2膜的沉积具有疏水性和光诱导的亲水性

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摘要

Graded TiO2 films were deposited on unheated glass substrates by using a twin dc magnetron sputtering system. The graded TiO2 films showed a highly polycrystalline structure of anatase with a little rutile phases revealed by X-ray diffraction spectra. The surface energy of the fresh and UV irradiated films were evaluated by water contact angle measurement. The results indicated that the water contact angle of the fresh graded TiO2 films was found within 100-112 degrees. The films then became a highly hydrophilic surface with the water contact angle of almost zero under 60 min UV irradiation. The XPS spectrum of Ti 2p revealed that the graded TiO2 films became a stoichiometric titanium oxide layer near the surface, proving that titanium was fully oxidized. It was found that the surface OH group density depended on the substrates employed for given sputtering conditions. In addition, AFM images revealed a considerably rough surface of the graded films with RMS roughness of 12.6-14.5 nm. One can conclude that the unique properties of highly hydrophobicity and photo-induced hydrophilicity can be attributed to fully oxidized chemical composition and higher roughness on the film surface. (c) 2005 Elsevier B.V. All rights reserved.
机译：通过使用双直流磁控溅射系统将渐变的TiO2薄膜沉积在未加热的玻璃基板上。渐变的TiO2薄膜显示出锐钛矿的高度多晶结构，而X射线衍射光谱显示出很少的金红石相。通过水接触角测量评估新鲜的和经紫外线辐射的膜的表面能。结果表明，新鲜梯度TiO2薄膜的水接触角在100-112度之间。然后该薄膜在60分钟的紫外线照射下变成高度亲水的表面，水接触角几乎为零。 Ti 2p的XPS光谱表明，渐变的TiO2薄膜在表面附近变成了化学计量的氧化钛层，证明钛已被完全氧化。已经发现，表面OH基团的密度取决于给定溅射条件所采用的衬底。此外，AFM图像显示渐变膜的表面相当粗糙，RMS粗糙度为12.6-14.5 nm。可以得出结论，高度疏水性和光诱导的亲水性的独特性质可以归因于完全氧化的化学成分和更高的膜表面粗糙度。 （c）2005 Elsevier B.V.保留所有权利。

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