文献类型：期刊文献

英文题名：Ferroelectric and switching behavior of poly(vinylidene fluoride-trifluoroethylene) copolymer ultrathin films with polypyrrole interface

作者：Xu, Haisheng[1]; Zhong, Juhua[1]; Liu, Xiaobing[1]; Chen, Jianhua[1]; Shen, Dong[2]

机构：[1]E China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Phys Chem Lab, Shanghai 200237, Peoples R China

年份：2007

卷号：90

期号：9

外文期刊名：APPLIED PHYSICS LETTERS

收录：;EI(收录号：20071010476431);WOS:【SCI-EXPANDED(收录号:WOS:000244591700070)】；

语种：英文

外文关键词：Copolymers - Ferroelectric materials - Interfaces (materials) - Polypyrroles - Remanence - Switching systems

摘要：Thin polypyrrole-poly(styrene sulfonate) acid film is employed as interface layers between both bottom and top metal electrodes of a ferroelectric polymer, poly(vinylidene fluoride-trifluoroethylene) copolymer capacitor. The sandwiched structure Titanium/polypyrrole-poly(styrene sulfonate)/poly(vinylidene fluoride-trifluoroethylene)/polypyrrole-poly(styrene sulfonate)/titanium shows prominent ferroelectric properties even as the thickness of P(VDF-TrFE) film is down to 500 A. The coercive voltage as low as 2.6 V is obtained with a remanent polarization of 86 mC/m(2) and a switching time of 30 mu s. The cell remains good ferroelectric properties at 60 degrees C, which is the operating temperature for many electronics. Moreover, the sandwiched structure shows excellent data retention, after more than 1x10(7) of switching cycles, the remanent polarization remains as high as 69 mC/m(2). The soft conductive polymer electrodes not only increase the crystallinity but also enhance the crystal dipole orientation comparing with the conventionally used metal electrodes. (c) 2007 American Institute of Physics.