材料科学
压电
压电系数
氟化物
离子键合
X射线光电子能谱
偶极子
电介质
复合数
离子
聚合物
制作
离子液体
化学工程
极化(电化学)
傅里叶变换红外光谱
复合材料
物理化学
光电子学
无机化学
化学
有机化学
催化作用
病理
工程类
医学
替代医学
作者
Zhiwei Ye,Juan Yi,Yibo Zhang,Chuanxi Xiong
标识
DOI:10.1002/admt.202401447
摘要
Abstract Poly(vinylidene fluoride) (PVDF) demonstrates great potential for applications in flexible sensing and energy harvesting but the piezoelectric coefficient is less than 30 pm V −1 even with the full beta phase. Herein, an all‐organic composite of PVDF with ionic liquid (IL) is manufactured through stretching, constrained annealing, and polarization. The DFT and XPS indicate strong ionic dipole interactions between PVDF and IL, favoring the orientation and crystallization of PVDF. Surprisingly, the nanobound states ions achieve orientation in different physical fields, providing ionic dipole enhances the piezoelectricity of the composite films, confirmed by variable temperature dielectric properties, FTIR and XRD. An inverse piezoelectric coefficient of 51.8 pm V −1 , obtained from PVDF containing 0.75 wt.% IL, improved by 116% compared to commercial PVDF (≈24 pm V −1 ). This work presents a novel composite strategy for the fabrication of high piezoelectric flexible polymers.
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