Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 103, Issue 2, Pages 455-461Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-010-6008-2
Keywords
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Funding
- CAPES (Brazil)
- DAAD (Germany) [D/08/11608]
- DFG [WA 2688/1-1]
- EU
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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.
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