Journal
APPLIED SURFACE SCIENCE
Volume 253, Issue 22, Pages 8841-8845Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2007.04.036
Keywords
superhydrophobic; PLD; PTFE
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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.
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