P(VDF-TrFE)弓膜中自发极化表面层的大有效压电响应

IF 2.1 3区 物理与天体物理 Q3 PHYSICS, APPLIED
Xinping Hu, Yuhong Zhu, Baojin Chu
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引用次数: 0

摘要

在这项工作中,我们证明了在具有拱形结构的非极性聚偏氟乙烯三氟乙烯(P(VDF-TrFE))共聚物薄膜中可以得到150 pC/N。通常被认为是均匀的共聚物薄膜,实际上在薄膜制造后在微观结构和物理性能上是不均匀的。尽管大部分共聚物薄膜是非极性的,正如在非极性铁电薄膜中所期望的那样,薄膜的表面区域是自发极化的。我们提出,表面区域的非均匀应力,无论是来自衬底的约束还是在薄膜制作过程中形成的表皮层效应,都会产生挠曲电响应并定向铁电薄膜的自发极化。由于极性表面区域的存在,非极性薄膜表现出压电响应。薄膜特殊的拱形结构进一步放大了压电响应,导致观察到较大的有效压电响应。本研究不仅发现了铁电聚合物薄膜中的极性表面效应,而且提出了一种设计具有强压电响应的聚合物材料的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Large effective piezoelectric response from the spontaneously polarized surface layer in P(VDF-TrFE) arch films
In this work, we show that a [Formula: see text]150 pC/N can be obtained in nonpoled poly(vinylidene fluoride trifluoroethylene) (P(VDF-TrFE)) copolymer films with an arch structure. The copolymer films, which are often thought to be homogeneous, are in fact inhomogeneous in microstructure and physical properties after film fabrication. Although a large proportion of the copolymer film is nonpolar, as expected in a nonpoled ferroelectric film, the surface regions of the film are spontaneously polarized. We propose that inhomogeneous stress in the surface regions, which is either from the constraint of the substrate or skin layer effect formed during the film fabrication, generates a flexoelectric response and orients the spontaneous polarization of the ferroelectric film. As a result of the polar surface regions, the nonpoled films exhibit a piezoelectric response. The piezoelectric response is further amplified by the special arch structure of the films, leading to the observed large effective piezoelectric response. This study not only discovers the polar surface effect in ferroelectric polymer films, but also proposes an approach to design polymer materials with a strong piezoelectric response.
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来源期刊
CiteScore
3.80
自引率
6.50%
发文量
36
审稿时长
18 weeks
期刊介绍: The Journal of Advanced Dielectrics is an international peer-reviewed journal for original contributions on the understanding and applications of dielectrics in modern electronic devices and systems. The journal seeks to provide an interdisciplinary forum for the rapid communication of novel research of high quality in, but not limited to, the following topics: Fundamentals of dielectrics (ab initio or first-principles calculations, density functional theory, phenomenological approaches). Polarization and related phenomena (spontaneous polarization, domain structure, polarization reversal). Dielectric relaxation (universal relaxation law, relaxor ferroelectrics, giant permittivity, flexoelectric effect). Ferroelectric materials and devices (single crystals and ceramics). Thin/thick films and devices (ferroelectric memory devices, capacitors). Piezoelectric materials and applications (lead-based piezo-ceramics and crystals, lead-free piezoelectrics). Pyroelectric materials and devices Multiferroics (single phase multiferroics, composite ferromagnetic ferroelectric materials). Electrooptic and photonic materials. Energy harvesting and storage materials (polymer, composite, super-capacitor). Phase transitions and structural characterizations. Microwave and milimeterwave dielectrics. Nanostructure, size effects and characterizations. Engineering dielectrics for high voltage applications (insulation, electrical breakdown). Modeling (microstructure evolution and microstructure-property relationships, multiscale modeling of dielectrics).
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