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. 2020 Jan 30;11:599. doi: 10.1038/s41467-019-14056-7

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© The Author(s) 2020

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 — a Pristine FS-COM-1 collected from the organic–organic solvent interface. b, c Cross-section SEM images of FS-COM-1. d Top-view SEM image of FS-COM-1. e AFM image and the thickness of the nanosheet. f TEM image of the nanosheet with micrometer scale. g High-resolution TEM patterns. h Digital images of substrate-supported membrane (FS-COM-1-VF). i Pristine FS-COM-2 collected from the organic–organic solvent interface (soaked in acetone). j Pristine FS-COM-2 collected from the organic–organic solvent interface (soaked in water). k, l Cross-section SEM images of FS-COM-2. Enlarged view of the inserted red box in k is shown in l.