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. 2019 Apr 4;11(4):627. doi: 10.3390/polym11040627

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© 2019 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 (http://creativecommons.org/licenses/by/4.0/).

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Surface morphology of samples after the treatment of Na₂S: (a) Ag-coated PP nonwoven; (b) PDA deposited (3 h) on the Ag-coated PP nonwoven; (c) PDA (6 h) deposited on the Ag-coated PP nonwoven; (d) PDA deposited (9 h) on the Ag-coated PP nonwoven; and (e) PDA deposited (12 h) on the Ag-coated PP nonwoven.