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The present study deals with a 3-layer sandwich of metal/FEP/ePTFE/FEP/metal, where the fluoroethylene propyl-ene (FEP) acts as electrical blocking layer and ePTFE is a 91% porous polyfluoroethylene layer which can be compressed mechanically. After proper charging such hybrid structures exhibit a large piezoelectric d33 coefficient comparable with conventional ferroelectric PZT ceramics. This piezoelectric...
Sandwich structures consisting of porous PTFE films clamped between two FEP Teflon films show large quasi- static piezoelectric coefficients due to high residual polarization formed by breakdown charges trapped at the interfaces between the two dielectrics. At the same time, the stability of polarization and the piezocoefficient is limited by rather high mobility of positive charges in FEP films....
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