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. 2016 Apr 30;10:26. doi: 10.1186/s13065-016-0167-y

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© Murguía-Flores et al. 2016

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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 9 — SEM images of a P; b N-P; c P-250; d P-2000. From (a)–(c) images were taken: (1) 5000×, (2) 10,000×, (3) 30,000×