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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/).
Transmission electron microscopy (TEM) image and selected area electron diffraction (SAED) pattern—insert (a), TEM image with a high-resolution transmission electron microscope (HRTEM) image—insert (b) and lateral view of the graphene layer indicating the thickness (c) of GO sheets.