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.
| Author details: | Feipeng WangORCiD, Alexander Lack, Zailai Xie, Peter FrübingORCiD, Andreas TaubertORCiDGND, Reimund GerhardORCiDGND |
|---|---|
| DOI: | https://doi.org/10.1063/1.3683526 |
| ISSN: | 0003-6951 |
| Title of parent work (English): | Applied physics letters |
| Publisher: | American Institute of Physics |
| Place of publishing: | Melville |
| Publication type: | Article |
| Language: | English |
| Year of first publication: | 2012 |
| Publication year: | 2012 |
| Release date: | 2017/03/26 |
| Tag: | dielectric polarisation; ferroelectric thin films; polymer films; pyroelectricity; spin coating |
| Volume: | 100 |
| Issue: | 6 |
| Number of pages: | 4 |
| Funding institution: | European Union |
| Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
| Peer review: | Referiert |
