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Ionic-liquid-induced ferroelectric polarization in poly(vinylidene fluoride) thin films

  • Thin films of ferroelectric beta-phase poly(vinylidene fluoride) (PVDF) were spin-coated from a solution that contained small amounts of the ionic liquid (IL) 1-ethyl-3-methylimidazolium nitrate. A remanent polarization of 60 mC/m(2) and a quasi-static pyroelectric coefficient of 19 mu C/m(2)K at 30 degrees C were observed in the films. It is suggested that the IL promotes the formation of the beta phase through dipolar interactions between PVDF chain-molecules and the IL. The dipolar interactions are identified as Coulomb attraction between hydrogen atoms in PVDF chains and anions in IL. The strong crystallinity increase is probably caused by the same dipolar interaction as well.

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Author:Feipeng Wang, Alexander Lack, Zailai Xie, Peter Fruebing, Andreas TaubertORCiDGND, Reimund Gerhard-MulthauptORCiDGND
ISSN:0003-6951 (print)
Parent Title (English):Applied physics letters
Publisher:American Institute of Physics
Place of publication:Melville
Document Type:Article
Year of first Publication:2012
Year of Completion:2012
Release Date:2017/03/26
Tag:dielectric polarisation; ferroelectric thin films; polymer films; pyroelectricity; spin coating
Funder:European Union
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert