Three-layer piezoelectrets from fluorinated ethylene-propylene (FEP) copolymer films

被引：31
|
作者：
Fang, Peng [1 ]
Wang, Feipeng [1 ]
Wirges, Werner [1 ]
Gerhard, Reimund [1 ]
Basso, Heitor Cury [2 ]
机构：
[1] Univ Potsdam, Inst Phys & Astron, Fac Sci, D-14476 Potsdam, Germany
[2] Univ Sao Paulo, Dept Elect Engn, Sao Carlos Sch Engn, BR-13566590 Sao Carlos, SP, Brazil
来源：
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2011年 / 103卷 / 02期
关键词：
FERROELECTRETS; POLYMER; CHARGE; SOFT;
D O I：
10.1007/s00339-010-6008-2
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A process for preparing three-layer piezoelectrets from fluorinated ethylene-propylene (FEP) copolymer films is introduced. Samples are made from commercial FEP films by means of laser cutting, laser bonding, electrode evaporation, and high-field poling. The observed dielectric-resonance spectra demonstrate the piezoelectricity of the FEP sandwiches. Piezoelectric d (33) coefficients up to a few hundred pC/N are achieved. Charging at elevated temperatures can increase the thermal stability of the piezoelectrets. Isothermal experiments for approximately 15 min demonstrate that samples charged at 140A degrees C keep their piezoelectric activity up to at least 120A degrees C and retain 70% of their initial d (33) even at 130A degrees C. Acoustical measurements show a relatively flat frequency response in the range between 300 Hz and 20 kHz.
引用
收藏
页码：455 / 461
页数：7
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