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. 2022 Dec 5;12(12):1227. doi: 10.3390/membranes12121227

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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) Raman spectra. From top to bottom: GO powder, CNT_COOH powder, and PVA film. (b) Raman spectra overlay of GO powder (green) and CNT_COOH powder (red).