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

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dc.citation.firstpage6724
dc.citation.issueNumber17
dc.citation.journalTitleChemistry of Materials
dc.citation.lastpage6730
dc.citation.volumeNumber33
dc.contributor.authorZhu, Dongyang
dc.contributor.authorHu, Zhiqi
dc.contributor.authorRogers, Tanya K.
dc.contributor.authorBarnes, Morgan
dc.contributor.authorTseng, Chia-Ping
dc.contributor.authorMei, Hao
dc.contributor.authorSassi, Lucas M.
dc.contributor.authorZhang, Zhuqing
dc.contributor.authorRahman, Muhammad M.
dc.contributor.authorAjayan, Pulickel M.
dc.contributor.authorVerduzco, Rafael
dc.date.accessioned2021-09-28T17:53:26Z
dc.date.available2021-09-28T17:53:26Z
dc.date.issued2021
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.
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.
dc.identifier.doihttps://doi.org/10.1021/acs.chemmater.1c01179
dc.identifier.urihttps://hdl.handle.net/1911/111409
dc.language.isoeng
dc.publisherAmerican Chemical Society
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.
dc.titlePatterning, Transfer, and Tensile Testing of Covalent Organic Framework Films with Nanoscale Thickness
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpost-print
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