Aarhus Universitets segl

Acid Exfoliation of Imine-linked Covalent Organic Frameworks Enables Solution Processing into Crystalline Thin Films

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review


  • David W Burke, Northwestern University
  • ,
  • Chao Sun
  • Ioannina Castano, Northwestern University
  • ,
  • Nathan C Flanders, Northwestern University
  • ,
  • Austin M Evans, Northwestern University
  • ,
  • Edon Vitaku, Northwestern University
  • ,
  • David C McLeod, U.S. Army Research Laboratory, Aberdeen Proving Ground
  • ,
  • Robert H Lambeth, U.S. Army Research Laboratory, Aberdeen Proving Ground
  • ,
  • Lin X Chen, Northwestern University
  • ,
  • Nathan C Gianneschi, Northwestern University
  • ,
  • William R Dichtel, Northwestern University

Covalent organic frameworks (COFs) are highly modular porous crystalline polymers that are of interest for applications such as charge-storage devices, nanofiltration membranes, and optoelectronic devices. COFs are typically synthesized as microcrystalline powders, which limits their performance in these applications, and their limited solubility precludes large-scale processing into more useful morphologies and devices. We report a general, scalable method to exfoliate two-dimensional imine-linked COF powders by temporarily protonating their linkages. The resulting suspensions were cast into continuous crystalline COF films up to 10 cm in diameter, with thicknesses ranging from 50 nm to 20 μm depending on the suspension composition, concentration, and casting protocol. Furthermore, we demonstrate that the film fabrication process proceeds through a partial depolymerization/repolymerization mechanism, providing mechanically robust films that can be easily separated from their substrates.

TidsskriftAngewandte Chemie International Edition
Sider (fra-til)5165-5171
Antal sider7
StatusUdgivet - 23 mar. 2020

Bibliografisk note

© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Se relationer på Aarhus Universitet Citationsformater

ID: 307684938