Ferroelectric properties of vinylidene fluoride/tetrafluoroethylene copolymer thin films consisting of needle-like crystals
Ferroelectric properties of vinylidene fluoride/tetrafluoroethylene copolymer thin films consisting of needle-like crystals
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DOI：
10.7567/jjap.55.051601
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发表时间：
2016-05-01
影响因子：
1.5
通讯作者：
Okamura, Soichiro
中科院分区：
文献类型：
--
作者：
Nakagawa, Yuuta;Hashizume, Yoichiro;Okamura, Soichiro
利用金溅射技术制备了具有针状晶结构的偏氟乙烯(VDF)/四氟乙烯(TEFE)共聚物铁电薄膜。将混合比为80：20mol%的VDF/TeFe薄膜在170℃下熔融30min，然后在116℃下再结晶300min。所合成的针状晶体中的分子为β相，呈200/110取向，而每个针状晶体的方向在平面上是随机的。在156 mV/m的外加电场和10 Hz的频率下，由针状晶体组成的450 nm厚的VDF/TeFe薄膜的剩余极化为62 mC/m(2)。62mC/m(2)的剩余极化比传统的由片状晶体组成的VDF/TeFe薄膜的剩余极化大约50%。(C)2016日本应用物理学会
Unique ferroelectric vinylidene fluoride (VDF)/tetrafluoroethylene (TeFE) copolymer thin films consisting of needle-like crystals were formed using Au-sputtered substrates. The VDF/TeFE films with a mixing ratio of 80 : 20mol% were melted at 170 degrees C for 30 min and then recrystallized at 116 degrees C for 300 min. The molecules in the resultant needle-like crystals had a beta-phase form and showed 200/110 orientation, while the direction of each needle-like crystal was random in-plane. The remanent polarization of the 450-nm-thick VDF/TeFE films consisting of the needle-like crystals were estimated to be 62mC/m(2) from the electric displacement vs electric field (D-E) hysteresis measurement at the applied field of 156MV/m and the frequency of 10Hz. The remanent polarization of 62mC/m(2) was approximately 50% larger than that of conventional VDF/TeFE films consisting of plate-like crystals. (C) 2016 The Japan Society of Applied Physics