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. 2015 Jun 29;5:11641. doi: 10.1038/srep11641

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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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SEM images of SiO₂ (A), NH₂-SiO₂ (B), graphene oxide (C), ASGO (100:2) (D), ASrGO (100:2) (E), pristine graphene sheets (F), ASG (100:0.5) (G), ASG (100:1) (H) and ASG (100:2) (I). HR-TEM images of ASG (100:2) in bulk view (J) and at high magnification (K, L).