Journal
APPLIED SURFACE SCIENCE
Volume 255, Issue 8, Pages 4446-4451Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2008.11.048
Keywords
Surface modification; X-ray photoelectron spectroscopy (XPS); Contact angle; Atomic force microscopy (AFM); Low-pressure RF plasma; Polyethylene terephthalate film
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Funding
- National Natural and Science Foundation of China [30571636, 20877062]
- Specialized Research Fund for the Doctoral Program of Higher Education [20060698002]
- Scientific Technique of Shaanxi Province [13115]
- Scientific Technique Item of Shuzhou City [SG0842]
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In this work, low-pressure air plasma has been used to improve polyethylene terephthalate (PET) surface properties for technical applications. Surface free energy values have been estimated using contact angle value for different exposure times and different test liquids. Surface composition and morphology of the films were analyzed by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Surface topography changes related with the etching mechanism have been followed by weight loss study. The results show a considerable improvement in surface wettability and the surface free energy values even for short exposure times in the different discharge areas (discharge area, afterglow area and remote area), as observed by a remarkable decrease in contact angle values. Change of chemical compositionmade the polymer surfaces to be highly hydrophilic, which mainly depends on the increase in oxygen-containing groups. In addition to, the surface activation and AFM analyses show obvious changes in surface topography as a consequence of the plasma-etching mechanism. (C) 2008 Elsevier B. V. All rights reserved.
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