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. 2020 Jan 10;11:178. doi: 10.1038/s41467-019-13739-5

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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 The SEM image of TQBQ-COF powder. Scale bar, 100 nm. b AFM height image of TQBQ-COF material. The inserted line shows a height of ~5.0 nm for 16 monolayers of TQBQ-COF. Scale bar, 300 nm. c N₂ adsorption/desorption isotherms of the heat-treated TQBQ-COF. The inset is the t-Plot analyses of the heat-treated sample. d The DOS of the simulated AB stacking structure for TQBQ-COF.