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. 2021 Aug 16;14(16):4590. doi: 10.3390/ma14164590

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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 (https://creativecommons.org/licenses/by/4.0/).

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SEM micrographs of graphenes with different layer numbers: (a) single-layer graphene, (b) bi-layer graphene, (c) tri-layer graphene [50], (d) large single layer graphene sheet and multi-layer regions (MLRs) (reproduced with permission from ref. [51], Copyright 2018, Elsevier).