Surface chemistry of atmospheric plasma modified polycarbonate substrates |
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Authors: | Houman Yaghoubi Nima Taghavinia |
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Institution: | a Department of Electrical Engineering, University of South Florida, Tampa, FL 33620, USA b New Materials Department, Material & Energy Research Center (MERC), P.O. Box 14155-4777, Tehran, Iran c Physics Department, Sharif University of Technology, Tehran 14588, Iran d Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran 14588, Iran |
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Abstract: | 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-C O)- 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%. |
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Keywords: | Atmospheric pressure plasma Surface modification Hydrophilic Hydrophobic Polar groups |
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