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. 2019 Jan 23;10:399. doi: 10.1038/s41467-019-08358-z

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© The Author(s) 2019

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. 1 — Characterization of ultrathin troilite FeS nanosheets. a FE-SEM image of FeS nanosheets grown on CFC (scale bar, 50 μm). b XRD patterns of FeS nanosheets. Inset: atomic structural model. c Top panel: AFM topographical image of a FeS nanosheet. Bottom panel: height profile of a FeS nanosheet is marked by arrow line. d TEM image of a FeS nanosheet (scale bar, 0.4 μm). Inset: the SAED pattern. e HR-TEM image of a FeS nanosheet (scale bar, 5 nm). Inset: the enlarged image (scale bar, 1 nm). f EDS mapping of FeS nanosheets grown on one carbon fiber (scale bar, 10 μm)