Scalable Fabrication of Crystalline COF Membranes from Amorphous Polymeric Membranes

Chunyang Fan, Hong Wu, Jingyuan Guan, Xinda You, Chao Yang, Xiaoyao Wang, Li Cao, Benbing Shi, Quan Peng, Yan Kong, Yingzhen Wu, Niaz Ali Khan, Zhongyi Jiang

Research output: Contribution to journalArticlepeer-review

69 Scopus citations


Covalent organic framework (COF) membranes hold potential for widespread applicability, but scalable fabrication is challenging. Here, we demonstrate the disorder-to-order transformation from amorphous polymeric membrane to crystalline COF membrane via monomer exchange. Solution processing is used to prepare amorphous membrane and the replacing monomer is selected based on the chemical and thermodynamical stability of the final framework. Reversible imine bonds allow the extraneous monomers to replace the pristine monomers within amorphous membrane, driving the transformation from disordered network to ordered framework. Incorporation of intramolecular hydrogen bonds enables the crystalline COF to imprint the amorphous membrane morphology. The COF membranes harvest proton conductivity up to 0.53 S cm−1 at 80 °C. Our strategy bridges amorphous polymeric and crystalline COF membranes for large-scale fabrication of COF membranes and affords guidance on materials processing.
Original languageEnglish (US)
Pages (from-to)18051-18058
Number of pages8
JournalAngewandte Chemie - International Edition
Issue number33
StatePublished - Aug 9 2021
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Catalysis


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