TY  - JOUR
A1  - Wang, Feipeng
A1  - Lack, Alexander
A1  - Xie, Zailai
A1  - Frübing, Peter
A1  - Taubert, Andreas
A1  - Gerhard, Reimund
T1  - Ionic-liquid-induced ferroelectric polarization in poly(vinylidene fluoride) thin films
JF  - Applied physics letters
N2  - 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.
KW  - dielectric polarisation
KW  - ferroelectric thin films
KW  - polymer films
KW  - pyroelectricity
KW  - spin coating
Y1  - 2012
U6  - https://doi.org/10.1063/1.3683526
SN  - 0003-6951
VL  - 100
IS  - 6
PB  - American Institute of Physics
CY  - Melville
ER  -