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. 2022 Mar 30;14(7):1421. doi: 10.3390/polym14071421

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© 2022 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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(a) The FTIR spectra for NS (reproduced Copyright 2022, with permission from Elsevier [33]); (b) shows the FTIR spectra for nano-ZnO (reproduced from [95]).