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. 2020 Apr 4;13(7):1687. doi: 10.3390/ma13071687

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© 2020 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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Digital photos of the samples: (a) chitosan (CS) film, (b) chitosan/ethylenediaminetetraacetic acid (CS/EDTA) film, (c) chitosan/ethylenediaminetetraacetic acid/graphene oxide (CS/EDTA/GO) film 0.1%, and (d) CS/EDTA/GO film 0.3%.