PVDF薄膜铁电性能的调控研究  

Study on Regulation Ferroelectric Properties of PVDF Thin Film

作　　者：郭聪 张丹 刘华一 徐海峰 刘雨桐 付跃举[1] GUO Cong;ZHANG Dan;LIU Huayi;XU Haifeng;LIU Yutong;FU Yueju(College of Physics Science&Technology,Hebei University,Baoding 071000,China)

机构地区：[1]河北大学物理科学与技术学院

出　　处：《人工晶体学报》2020年第1期39-43,共5页Journal of Synthetic Crystals

基　　金：河北省自然科学基金-青年科学基金(206020315045)

摘　　要：近年来,随着微机电系统(MEMS)地不断发展,对微型材料的柔性、可加工性以及电活性提出了更高的要求。PVDF作为优秀的柔性铁电材料而备受关注。为提高柔性PVDF薄膜的铁电性能,研究同时使用了三种方法:(1)在分子链中引入Tr FE;(2)在溶液体系中掺杂低浓度的BaTiO3;(3)对薄膜使用热拉伸方法。考察了BaTiO3掺杂浓度和热拉伸温度对铁电性能的影响。结果表明:三种方法均能有效提高PVDF的铁电性能;在三种方法的共同作用下,薄膜的剩余极化强度到达了19. 8μC/cm2。钛酸钡掺杂浓度过低会使整个体系无法形成致密结构,掺杂浓度过高会形成团簇,导致薄膜的缺陷增多,适当的掺杂浓度可以有效提高薄膜的铁电性能。此外,使用适当的拉伸温度使偶极子活动能力增强,增加铁电相的含量。通过三种方法对薄膜的铁电性进行优化,为有机柔性材料的电活性调控提供了一个可行思路。In recent years, with the rapid development of micro-electro-mechanical systems( MEMS), more urgent requirements have been put forward for the flexibility and electrical activity strength of ferroelectric materials. PVDF has attracted much attention as an excellent flexible ferroelectric material. In order to improve the ferroelectric properties of flexible PVDF films,three methods were used simultaneously in this paper. The three methods are(1) introducing Tr FE into molecular chains,(2) doping low concentration BaTiO3 in solution system,(3) using thermal stretching method for thin films.The experimental results show that all three methods can effectively improve the ferroelectric properties of PVDF. The remnant polarization intensity of the films reached 19. 8 μC/cm2. The low concentration of BaTiO3 doping will make the whole system unable to form a dense structure. High doping concentration will lead to the formation of clusters,resulting in the increase of defects in the film. Appropriate doping concentration can effectively improve the ferroelectric properties of thin films. In addition,the use of appropriate stretch temperature increases the molecular polarity and increases the ferroelectric phase content,the overall flexibility of the film greatly improves its application value.

关 键 词：铁电性能 柔性 热拉伸 剩余极化强度 

分 类 号：O484[理学—固体物理]