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. 2017 Jul 28;24(27):21671–21679. doi: 10.1007/s11356-017-9788-5

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — Characterization of pristine graphene (a, d), oxidized graphene (b, e), and reduced oxidized graphene (c, f) by transmission electron microscopy (a, b, c) and scanning electron microscopy (d, e, f)