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. 2020 Jul 1;10(7):1295. doi: 10.3390/nano10071295

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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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SEM images of (A) graphite, (B) graphene oxide, (C) interconnected reduced graphene oxide (IC-rGO), and (D) N-doped IC-rGO (N-IC-rGO). Figure 1C,D (reproduced from ref. [81], with permission from Elsevier, 2020).