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. 2020 Jun 11;10:9478. doi: 10.1038/s41598-020-66423-w

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Optimization of plasma exposure time used for post-treatment of PMEOx coatings. (a) FTIR spectra of PMEOx powder (red dot line), PMEOx layer (black line) and treated PMEOx layer in different air plasma exposure times – 3 s (grey line), 10 s (blue line), 30 s (magenta line), without washing; (b) Relative concentrations of particular chemical bonds from high-resolution C1s spectra of air-plasma treated PMEOx layer as a function of plasma exposure time measured by XPS.