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. 2020 Mar 3;12(3):559. doi: 10.3390/polym12030559

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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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Raman spectroscopy of all films in this study, (a) denotes the EMI:TFSI treated films from 0% to 2.5% concentrations, meanwhile (b) corresponds to the NaBH₄-DMSO solution treatment on the 0% to 2.5% EMIM:TFSI films.