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Negative piezoelectric effect in an organic supramolecular ferroelectric
Linköping University, Department of Physics, Chemistry and Biology, Complex Materials and Devices. Linköping University, Faculty of Science & Engineering.
Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands .
Department of Chemistry – BMC, Uppsala University, Uppsala, Sweden.
Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands .
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2019 (English)In: Materials Horizons, ISSN 2051-6347, E-ISSN 2051-6355, Vol. 6, p. 1688-1698Article in journal (Refereed) Published
Abstract [en]

The vast majority of ferroelectric materials demonstrate a positive piezoelectric effect. Theoretically, the negative piezoelectric coefficient d33 could be found in certain classes of ferroelectrics, yet in practice, the number of materials showing linear longitudinal contraction with increasing applied field (d33 < 0) is limited to few ferroelectric polymers. Here, we measure a pronounced negative piezoelectric effect in the family of organic ferroelectric small-molecular BTAs (trialkylbenzene-1,3,5-tricarboxamides), which can be tuned by mesogenic tail substitution and structural disorder. While the large- and small-signal strain in highly-ordered thin-film BTA capacitor devices are dominated by intrinsic contributions and originates from piezostriction, rising disorder introduces additional extrinsic factors that boost the large-signal d33 up to −20 pm V’1 in short-tailed molecules. Interestingly, homologues with longer mesogenic tails show a large-signal electromechanical response that is dominated by the quadratic Maxwell strain with significant mechanical softening upon polarization switching, whereas the small-signal strain remains piezostrictive. Molecular dynamics and DFT calculations both predict a positive d33 for defect-free BTA stacks. Hence, the measured negative macroscopic d33 is attributed to the presence of structural defects that enable the dimensional effect to dominate the piezoelectric response of BTA thin films.

Place, publisher, year, edition, pages
Royal Society of Chemistry , 2019. Vol. 6, p. 1688-1698
National Category
Textile, Rubber and Polymeric Materials Condensed Matter Physics Theoretical Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-160355DOI: 10.1039/C9MH00094AOAI: oai:DiVA.org:liu-160355DiVA, id: diva2:1352728
Available from: 2019-09-19 Created: 2019-09-19 Last updated: 2019-09-19Bibliographically approved

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Urbanaviciute, IndreCornelissen, Tim D.Linares, MathieuKemerink, Martijn

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Textile, Rubber and Polymeric MaterialsCondensed Matter PhysicsTheoretical Chemistry

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