Reversible UV-Light-Induced Ultrahydrophobic-to-Ultrahydrophilic Transition in an α-Fe2O3 Nanoflakes Film

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• 作者：Bin Yan ; Junguang Tao ; Christina Pang ; Zhe Zheng ; Zexiang Shen ; Cheng Hon Alfred Huan ; Ting Yu
• 刊名：Langmuir
• 出版年：2008
• 出版时间：October 7, 2008
• 年：2008
• 卷：24
• 期：19
• 页码：10569-10571
• 全文大小：188K
• 年卷期：v.24,no.19(October 7, 2008)
• ISSN：1520-5827

文摘

We describe a simple and robust approach to fabricating an α-Fe₂O₃ switchable surface. The hydrophobicity of α-Fe₂O₃ nanostructures was observed for the first time. A remarkable surface wettability transition can be easily achieved by ultraviolet (UV) illumination. The distinctive properties of surface defects are disclosed by X-ray photoelectron spectroscopy (XPS) analysis. The nanoscale adsorption and photocatalytic properties of Fe²⁺ defects account for the highly amphiphilic character of the surfaces. We believe that the experiment will further the molecular-scale understanding and manipulation of the wetting behavior on smart devices.