Journal
SCIENCE
Volume 375, Issue 6587, Pages 1418-+Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.abn0936
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Funding
- US Office of Naval Research [N00014-19-1-2028]
- NCSU [N00014-19-1-2033]
- National Science Foundation [DMR-2103196]
- National Natural Science Foundation of China [52076127]
- DOE [DE-AC05-00OR22725]
- US DOE User Facility operated by BNL [DE-SC0012704]
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Introducing a small amount of fluorinated alkyne monomers enhances the polarization change in ferroelectric polymers, leading to a strong electromechanical coupling effect.
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 fluoridetrifluoroethylene-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 (k(33)) of 88% and a piezoelectric coefficient (d(33)) >1000 picometers per volt. These values make this solution-processed polymer competitive with ceramic oxide piezoelectrics, with the potential for use in distinct applications.
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