Superhydrophobicity of polytetrafluoroethylene thin film fabricated by pulsed laser deposition

被引:75
作者
Kwong, H. Y. [1 ]
Wong, M. H. [1 ]
Wong, Y. W. [1 ]
Wong, K. H. [1 ]
机构
[1] Hong Kong Polytech Univ, Dept Appl Phys, Kowloon, Hong Kong, Peoples R China
关键词
superhydrophobic; PLD; PTFE;
D O I
10.1016/j.apsusc.2007.04.036
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Superhydrophobic polytetrafluoroethylene (PTFE) thin films were obtained by pulsed laser deposition (PLD) technique carried out with KrF excimer laser (lambda = 248 nm) of about 1 J/cm(2) at a pressure of 1.33 Pa. The samples exhibit high water contact angle of about 170 degrees and the sliding angle smaller than 2 degrees. From studying the surface morphology of the prepared films, it is believed that the nano-scale surface roughness has enhanced the hydrophobic property of the PTFE. The increase of trapping air and reducing liquid-solid contact area due to the rough surface, as suggested by the Cassie-Baxter's model, should be responsible for superhydrophobicity of the PLD prepared films. This study thus provides a convenient one-step method without using wet-process to produce a superhydrophobic surface with good self-cleaning properties. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:8841 / 8845
页数:5
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