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. 2017 Mar 3;7:42233. doi: 10.1038/srep42233

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Optical images of the 3D printable graphene/PLA (A), the 3D printing process (B) and a variety of printed 3DEs used throughout this study (C). Corresponding SEM (D), Raman (E) and XPS analysis of the printed 3DE are also presented.