Relaxor ferroelectric polymer exhibits ultrahigh electromechanical coupling at low electric field
Electromechanical (EM) coupling—the conversion of energy between electric and mechanical forms—in ferroelectrics has been used for a broad range of applications. Ferroelectric polymers have weak EM coupling that severely limits their usefulness for applications. We introduced a small amount of fluorinated alkyne (FA) monomers (<2 mol %) in relaxor ferroelectric poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (PVDF-TrFE-CFE) terpolymer that markedly enhances the polarization change with strong EM coupling while suppressing other polarization changes that do not contribute to it. Under a low–dc bias field of 40 megavolts per meter, the relaxor tetrapolymer has an EM coupling factor (k33) of 88% and a piezoelectric coefficient (d33) >1000 picometers per volt. These values make this solution-processed polymer competitive with ceramic oxide piezoelectrics, with the potential for use in distinct applications.
This is the author's version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science 375, 2022-03-25, doi: 10.1126/science.abn0936.
|Work Title||Relaxor ferroelectric polymer exhibits ultrahigh electromechanical coupling at low electric field|
|License||In Copyright (Rights Reserved)|
|Publication Date||March 24, 2022|
|Publisher Identifier (DOI)||
|Deposited||February 17, 2023|
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