Ferro- and ferrielectricity and negative piezoelectricity in thioamide-based supramolecular organic discotics.
Phys Chem Chem Phys
; 25(25): 16930-16937, 2023 Jun 28.
Article
em En
| MEDLINE
| ID: mdl-37325999
ABSTRACT
Amide-based discotic supramolecular organic materials are of interest for fundamental understanding of cooperative self-assembly and collective dipole switching mechanisms as well as for practically relevant ferroelectric and piezoelectric properties. Here, we show how replacing amides (dipole moment of â¼3.5 D) with thioamides (â¼5.1 D) as dipolar moieties in the archetypal C3-symmetric discotic molecule BTA leads to ferroelectric materials with a higher remnant polarization and lower coercive field. The thioamide-based materials also demonstrate a rare negative piezoelectricity and a previously predicted, yet never experimentally observed, polarization reversal via asymmetric intermediate states, that is, ferrielectric switching.
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MEDLINE
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Ano de publicação:
2023
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Article