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. 2021 Nov 25;26(23):7133. doi: 10.3390/molecules26237133

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Effect of 60 s of direct exposure to Ar plasma on polymer coating fabricated at 15 W on PET. (A) FTIR spectra before and after treatment. (B) A typical XPS wide scan spectrum of treated polymer coating. Inset: high resolution spectra for oxygen and carbon. (C) AFM images after treatment. Scan size 10 × 10 µm. Inset scan size 1 × 1 µm. (D) Contact angle evolution as a function of treatment time. Oxygen to carbon ratio based on XPS atomic fractions shows an increase in oxygen content within the topmost layer of the polymer coating.