Tailoring the wettability of nanocrystalline TiO2 films |
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| Authors: | Qiyu LiangYan Chen Yuzun FanYong Hu Yuedong WuZiqiang Zhao Qingbo Meng |
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| Institution: | a Institute of Heavy Ion Physics, State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, PR China
b Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100190, PR China |
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| Abstract: | The water contact angle (WCA) of nanocrystalline TiO2 films was adjusted by fluoroalkylsilane (FAS) modification and photocatalytic lithography. FAS modification made the surface hydrophobic with the WCA up to ∼156°, while ultraviolet (UV) irradiation changed surface to hydrophilic with the WCA down to ∼0°. Both the hydrophobicity and hydrophilicity were enhanced by surface roughness. The wettability can be tailored by varying the concentration of FAS solution and soaking time, as well as the UV light intensity and irradiation time. Additionally, with the help of photomasks, hydrophobic-hydrophilic micropatterns can be fabricated and manifested via area-selective deposition of polystyrene particles. |
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| Keywords: | Nanocrystalline TiO2 films Photocatalytic lithography Wettability control Superhydrophobic Superhydrophilic Micropattern |
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