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. 2017 Jul 12;7:5259. doi: 10.1038/s41598-017-05693-3

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(A) HR-SEM image of Type II surfaces showing the morphology of GNS attached to the surface; (B) Type III surfaces showing AgNPs as small bright dots on top of the GNS monolayer. (C,D) SEM imaging of Type III slide cross-section showing (C) secondary electron detector topographic image and (D) backscattering electron detector (SEM BSD) image, with bright spots corresponding to the GNS monolayer (The sample is oriented upwards, from bottom to top: glass, GNS, SiO₂, AgNP).