Surface chemistry of atmospheric plasma modified polycarbonate substrates

Yaghoubi, H ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1016/j.apsusc.2011.06.034
  3. Publisher: 2011
  4. Abstract:
  5. Surface of polycarbonate substrates were activated by atmospheric plasma torch using different gas pressure, distance from the substrates, velocity of the torch and number of treatments. The modifications were analyzed by contact angle measurements, X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and UV-vis spectrophotometry. Plasma treatment caused the surface characteristics to become more hydrophilic as measured by the water contact angle, which decreased from 88° to 18°. The decrease in contact angle was mainly due to oxidation of the surface groups, leading to formation of polar groups with hydrophilic property. XPS results showed an increase in the intensity of -(C-O)- groups and also introduction of new functional groups i.e. -(O-CO)- after the treatment process. AFM topographic images demonstrated an increase in the rms roughness of the surface from 2.0 nm to 4.0 nm caused by the treatment. Increase in rms roughness of the surface caused relevant decrease in transmission up to ∼2-5%
  6. Keywords:
  7. Surface modification ; AFM ; Atmospheric plasma torch ; Atmospheric plasmas ; Atmospheric pressure plasmas ; Gas pressures ; Hydrophilic ; Hydrophilic properties ; Hydrophobic ; Plasma treatment ; Polar groups ; Polycarbonate substrates ; RMS roughness ; Surface characteristics ; Surface groups ; Topographic images ; Treatment process ; UV-vis spectrophotometry ; Water contact angle ; Angle measurement ; Atmospheric chemistry ; Atmospheric pressure ; Atomic force microscopy ; Atomic spectroscopy ; Contact angle ; Functional groups ; Hydrophilicity ; Photoelectron spectroscopy ; Plasma applications ; Plasma torches ; Plasmas ; Surface chemistry ; X ray photoelectron spectroscopy ; Surface roughness
  8. Source: Applied Surface Science ; Volume 257, Issue 23 , September , 2011 , Pages 9836-9839 ; 01694332 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0169433211008968