Patterning, Transfer, and Tensile Testing of Covalent Organic Framework Films with Nanoscale Thickness

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dc.citation.firstpage6724en_US
dc.citation.issueNumber17en_US
dc.citation.journalTitleChemistry of Materialsen_US
dc.citation.lastpage6730en_US
dc.citation.volumeNumber33en_US
dc.contributor.authorZhu, Dongyangen_US
dc.contributor.authorHu, Zhiqien_US
dc.contributor.authorRogers, Tanya K.en_US
dc.contributor.authorBarnes, Morganen_US
dc.contributor.authorTseng, Chia-Pingen_US
dc.contributor.authorMei, Haoen_US
dc.contributor.authorSassi, Lucas M.en_US
dc.contributor.authorZhang, Zhuqingen_US
dc.contributor.authorRahman, Muhammad M.en_US
dc.contributor.authorAjayan, Pulickel M.en_US
dc.contributor.authorVerduzco, Rafaelen_US
dc.date.accessioned2021-09-28T17:53:26Zen_US
dc.date.available2021-09-28T17:53:26Zen_US
dc.date.issued2021en_US
dc.description.abstractCovalent organic frameworks (COFs) are promising materials for a variety of applications, including membrane-based separations, thin-film electronics, and as separators for electrochemical devices. Robust mechanical properties are critical to these applications, but there are no reliable methods for patterning COFs or producing free-standing thin films for direct mechanical testing. Mechanical testing of COFs has only been performed on films supported by a rigid substrate. Here, we present a method for patterning, transferring, and measuring the tensile properties of free-floating nanoscale COF films. We synthesized COF powders by condensation of 1,3,5-tris(4-aminophenyl)benzene (TAPB) and terephthalaldehyde (PDA) and prepared uniform thin films by spin casting from a mixture of trifluoroacetic acid and water. The COF films were then reactivated to recover crystallinity and patterned by plasma etching through a poly(dimethylsiloxane) (PDMS) mask. The films were transferred to the surface of water, and we performed direct tensile tests. We measured a modulus of approximately 1.4 GPa for TAPB-PDA COF and a fracture strain of 2.5%, which is promising for many applications. This work advances the development of COFs for thin-film applications by demonstrating a simple and generally applicable approach to cast, pattern, and transfer COF thin films and to perform direct mechanical analysis.en_US
dc.identifier.citationZhu, Dongyang, Hu, Zhiqi, Rogers, Tanya K., et al.. "Patterning, Transfer, and Tensile Testing of Covalent Organic Framework Films with Nanoscale Thickness." <i>Chemistry of Materials,</i> 33, no. 17 (2021) American Chemical Society: 6724-6730. https://doi.org/10.1021/acs.chemmater.1c01179.en_US
dc.identifier.doihttps://doi.org/10.1021/acs.chemmater.1c01179en_US
dc.identifier.urihttps://hdl.handle.net/1911/111409en_US
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Chemical Society.en_US
dc.titlePatterning, Transfer, and Tensile Testing of Covalent Organic Framework Films with Nanoscale Thicknessen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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