Piezo- and pyroelectricity of a polymer-foam space-charge electret

G. Neaugschwandtner, R. Schwödiauer, Simona Bauer-Gogonea, Siegfried Bauer, Mika Paajanen, Jukka Lekkala

Research output: Contribution to journalArticleScientificpeer-review

104 Citations (Scopus)


Charged closed-cell polypropylene polymer foams are highly sensitive and broadband piezoelectric materials with a quasistatic piezoelectric d33 coefficient about 250 pC/N and a dynamic d33 coefficient of 140 pC/N at 600 kHz. The piezoelectric coefficient is much larger than that of ferroelectric polymers, like polyvinylidene fluoride, and compares favorably with ferroelectric ceramics, such as lead zirconate titanate. The pyroelectric coefficient p3=0.25 μC/m2 K is small in comparison to ferroelectric polymers and ferroelectric ceramics. The low density, small pyroelectric coefficient and high piezoelectric sensitivity make charged polymer foams attractive for a wide range of sensor and transducer applications in acoustics, air-borne ultrasound, medical diagnostics, and nondestructive testing.
Original languageEnglish
Pages (from-to)4503-4511
Number of pages9
JournalJournal of Applied Physics
Issue number8
Publication statusPublished - 2001
MoE publication typeA1 Journal article-refereed

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