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. 2015 Aug 20;10:332. doi: 10.1186/s11671-015-1031-z

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© Xie et al. 2015

Open AccessThis 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. 4 — XPS C1s and N1s spectra of GO-N (a, b), GO-N-180 (c, d), and GO-OOH-N (e, f); N-containing groups distribution in N-doped graphene samples (g); types of N-containing groups (h)