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. 2016 Sep 16;6:33525. doi: 10.1038/srep33525

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Copyright © 2016, 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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SEM image of (a) the surface image of the TrGOF, EDX spectrum (b) and corresponding element mapping (inset b). SEM image (c) of the cross section of TrGOF, EDX spectrum (d) and corresponding distribution of element (inset d). (e) Concentration depth profile of C 1s in the TrGOF using a monochromatic X-ray source and an argon ion-beam. Inset: the set of C 1s spectra measured during a depth profiling experiment.