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. 2021 Mar 5;21(5):1802. doi: 10.3390/s21051802

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© 2021 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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TEM photographs: (a) pristine graphene flakes with lateral size of several hundred nm folded and casually overlapped; (b) Gr-ZnO/NP nanocomposites. The nanoparticles are mainly amassed along the edges of the flakes.