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. 2020 Oct 21;11:5323. doi: 10.1038/s41467-020-19182-1

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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. 3 — a Top-view SEM image. b cross-section SEM image and the illustrated three membrane regions from top to the center. c TEM image of the top polycarbazole layer d Pore size distribution of the top polycarbazole layer. e Pore size distribution of the intermediate and central regions. The pore size distribution was calculated from the corresponding N₂ adsorption isotherm using the NLDFT method.