Highly Flexible Dielectric Films from Solution Processable Covalent Organic Frameworks**

Senarathna, Milinda C.; Li, He; Perera, Sachini D.; Torres‐Correas, Jose; Diwakara, Shashini D.; Boardman, Samuel R.; Al‐Kharji, Noora M.; Liu, Yi; Smaldone, Ronald A.

doi:10.1002/anie.202312617

Title: Highly Flexible Dielectric Films from Solution Processable Covalent Organic Frameworks**

Journal Article · 18 October 2023 · Angewandte Chemie (International Edition)

DOI: https://doi.org/10.1002/anie.202312617 · OSTI ID:2369574

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^[1]; Torres‐Correas, Jose ^[1];

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Univ. of Texas at Dallas, Richardson, TX (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry

Covalent organic frameworks (COFs) are known to be a promising class of materials for a wide range of applications, yet their poor solution processability limits their utility in many areas. Here we report a pore engineering method using hydrophilic side chains to improve the processability of hydrazone and β-ketoenamine-linked COFs and the production of flexible, crystalline films. Further, mechanical measurements of the free-standing COF films of COF-PEO-3 (hydrazone-linked) and TFP-PEO-3 (β-ketoenamine-linked), revealed a Young's modulus of 391.7 MPa and 1034.7 MPa, respectively. The solubility and excellent mechanical properties enabled the use of these COFs in dielectric devices. Specifically, the TFP-PEO-3 film-based dielectric capacitors display simultaneously high dielectric constant and breakdown strength, resulting in a discharged energy density of 11.22 J cm^-3. This work offers a general approach for producing solution processable COFs and mechanically flexible COF-based films, which hold great potential for use in energy storage and flexible electronics applications.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); US Army Research Laboratory (USARL); American Chemical Society Petroleum Research Fund (ACS-PRF)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2369574

Journal Information:: Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 49 Vol. 62; ISSN 1433-7851

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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