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

被引：67

作者：

Wang, Feipeng ^{[1
]}

Lack, Alexander ^{[1
]}

Xie, Zailai ^{[1
]}

Fruebing, Peter ^{[1
]}

Taubert, Andreas ^{[2
]}

Gerhard, Reimund ^{[1
]}

机构：

[1] Univ Potsdam, Inst Phys & Astron, D-14476 Potsdam, Germany

[2] Univ Potsdam, Inst Chem, D-14476 Potsdam, Germany

来源：

APPLIED PHYSICS LETTERS | 2012年 / 100卷 / 06期

关键词：

dielectric polarisation; ferroelectric thin films; polymer films; pyroelectricity; spin coating; FIELD-EFFECT TRANSISTORS; POLYMERS; PRESSURE;

D O I：

10.1063/1.3683526

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. (C) 2012 American Institute of Physics. [doi:10.1063/1.3683526]

引用

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