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

被引：0
|
作者：
Peng Fang
Feipeng Wang
Werner Wirges
Reimund Gerhard
Heitor Cury Basso
机构：
[1] University of Potsdam,Applied Condensed
[2] University of São Paulo,Matter Physics, Institute of Physics and Astronomy, Faculty of Science
来源：
Applied Physics A | 2011年 / 103卷
关键词：
Laser Cutting; Copolymer Film; Recording Distance; Dielectric Resonance; Polyethylene Naphthalate;
D O I：
暂无
中图分类号：
学科分类号：
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 d33 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 140°C keep their piezoelectric activity up to at least 120°C and retain 70% of their initial d33 even at 130°C. Acoustical measurements show a relatively flat frequency response in the range between 300 Hz and 20 kHz.
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页码：455 / 461
页数：6
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