Controlled preparation of titania nanofilm by a template of polydopamine film and its reversible wettability

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• 作者：Longzhen Zheng ; ^{zlz@ecjtu.jx.cn} ; Qiang Liu ; Leyan Xiong ; Yindi Li ; Kui Han ; Wen Liu ; Kun Tao ; Shaoming Yang ; Jian Xia
• 关键词：Titanium dioxide ; Thin films ; Polydopamine ; Contact angle ; Hydrophilic conversion ; Wetting ; Glass substrate
• 刊名：Thin Solid Films
• 出版年：2012
• 出版时间：31 January 2012
• 年：2012
• 卷：520
• 期：7
• 页码：2776-2780
• 全文大小：804 K

文摘

Titanium oxide (TiO₂) nanofilm was prepared by a simple method of sol-gel deposition on the glass substrate, which was pre-modified with a polydopamine (PDA) film. The as-prepared TiO₂ nanofilm was analyzed by X-ray diffraction, scanning electron microscopy, and atomic force microscopy. The thickness of TiO₂ film can be controlled by the thickness of PDA film, which was dependent on the polymerization time. The mechanism of wettability conversion on TiO₂ film was investigated by means of contact angle measurements in different experimental conditions. The results demonstrated that humidity was the major factor for converting the hydrophobic surface of TiO₂ film into hydrophilic surface under ultra-violet (UV) irradiation. And atmospheric oxygen played dominant role in reconverting the hydrophilic surface of TiO₂ film into hydrophobic surface when it was stored in the dark. The TiO₂ nanofilm showed reversible hydrophobic/hydrophilic conversion in the condition of alternating between UV irradiation and storage in the dark.