Abstract The hydrophobicity of the lotus leaf is mainly due to its surface micro--nano composite structure. In order to mimic the lotus structure, ZnO micro--nano composite hydrophobic films were prepared via the three-step method. On thin buffer films of SiO2, which were first fabricated on glass substrates by the sol--gel dip-coating method, a ZnO seed layer was deposited via RF magnetron sputtering. Then two different ZnO films, micro--nano and micro-only flower-like structures, were grown by the hydrothermal method. The prepared films have different hydrophobic properties after surface modification. The structures of the obtained ZnO films were characterized using x-ray diffraction and field-emission scanning electron microscopy. A conclusion that a micro--nano composite structure is more beneficial to hydrophobicity than a micro-only structure was obtained through research into the effect of structure on hydrophobic properties.
Received: 27 July 2008
Revised: 26 November 2008
Accepted manuscript online:
PACS:
81.16.-c
(Methods of micro- and nanofabrication and processing)
Fund: Project supported by the Science
Fund of Anhui Province, China (Grant No 070414187) and the National
Fund for Fostering Talents in
Basic Science of China (Grant No J0630319/J0103).
Cite this article:
Ma Kai(马恺), Li Hua(李华), Zhang Han(张晗), Xu Xiao-Liang(许小亮), Gong Mao-Gang(公茂刚), and Yang Zhou(杨周) ZnO micro-nano composite hydrophobic film prepared by the three-step method 2009 Chin. Phys. B 18 1942
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