Large piezoelectric effects in charged, heterogeneous fluoropolymer electrets |
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| Authors: | GS Neugschwandtner R Schwödiauer S Bauer-Gogonea S Bauer |
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| Institution: | (1) Department of Applied Physics, Johannes-Kepler-University, Altenberger Str. 69, 4040 Linz, Austria (Fax: +43-732/2468-9242, E-mail: sbauer@jk.uni-linz.ac.at), AT |
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| Abstract: | Large piezoelectric d33 coefficients around 600 pC/N are found in corona-charged non-uniform electrets consisting of elastically “soft” (microporous
polytetrafluoroethylene PTFE) and “stiff” (perfluorinated cyclobutene PFCB) polymer layers. The piezoelectric activity of
the two-layer fluoropolymer stack exceeds the d33 coefficient of the ferroelectric ceramic lead zirconate titanate (PZT) by more than a factor of two and that of the ferroelectric
polymer polyvinylidene fluoride (PVDF) by a factor of 20. Soft piezoelectric materials may become interesting for a large
number of sensor and transducer applications, in areas such as security systems, medical diagnostics, and nondestructive testing.
Accepted: 9 November 1999 / Published online: 3 December 1999 |
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| Keywords: | PACS: 77 65 -j 77 84 Jd 85 50 +k |
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