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. 2018 Jul 17;9:2786. doi: 10.1038/s41467-018-05238-w

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© The Author(s) 2018

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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Fig. 2 — Structural and compositional characterizations. a Photograph of a piece of AATN hydrogel. Scale bar, 5 mm. b Top-view SEM image of AATN hydrogel. Scale bar, 100 μm. c, d Different magnifications of side-view SEM images of AATN hydrogel. Scale bars, 100 μm in c and 20 μm in d. e Further magnified SEM image of the lamella in AATN hydrogel. Scale bar, 500 nm. f EDS spectrum of AATN hydrogel. g Elemental mappings of Ag, C, N, and S elements in AATN hydrogel in d. Scale bars, 20 μm