Large and broadband piezoelectricity in smart polymer-foam space-charge electrets

Charged closed-cell microporous polypropylene foams are shown to exhibit piezoelectric resonance modes in the dielectric function, coupled with a large anisotropy in the electromechanical and elastic material properties. Strong direct and converse dynamic piezoelectricity with a piezoelectric d33 co...

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Bibliographic Details
Published in:Applied physics letters 2000-12, Vol.77 (23), p.3827-3829
Main Authors: Neugschwandtner, G. S., Schwödiauer, R., Vieytes, M., Bauer-Gogonea, S., Bauer, S., Hillenbrand, J., Kressmann, R., Sessler, G. M., Paajanen, M., Lekkala, J.
Format: Article
Language:English
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Summary:Charged closed-cell microporous polypropylene foams are shown to exhibit piezoelectric resonance modes in the dielectric function, coupled with a large anisotropy in the electromechanical and elastic material properties. Strong direct and converse dynamic piezoelectricity with a piezoelectric d33 coefficient of 140 pC/N at 600 kHz is identified. The piezoelectric d33 coefficient exceeds that of the ferroelectric polymer polyvinylidene fluoride by a factor of 5 and compares favorably with ferroelectric ceramics. Applications of similar concepts should provide a broad class of easily fabricated “soft” piezoelectric materials.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1331348