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Proceedings Paper

Cellular ferroelectrets for electroactive polymer hybrid systems: soft matter integrated devices with advanced functionality
Author(s): Reinhard Schwödiauer; Ingrid Graz; Martin Kaltenbrunner; Christoph Keplinger; Petr Bartu; Gerda Buchberger; Christoph Ortwein; Siegfried Bauer
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Paper Abstract

Thin polymer foams with a closed cell void-structure can be internally charged by silent or partial discharges within the voids. The resulting material, which carries positive and negative charges on the internal void surfaces is called a ferroelectret. Ferroelectrets behave like typical ferroelectrics, hence they provide a novel class of ferroic materials. The soft foams are strongly piezoelectric in the 3-direction, but show negligible piezoelectric response in the transverse direction. This, together with a very low pyroelectric coefficient, make ferroelectrets highly suitable for flexible electroactive transducer element which can be integrated in thin bendable organic electronic devices. Here we describe some fundamental characteristics of cellular ferroelectrets and present a number of promising examples for a possible combination with various functional polymer systems. Our examples focus on flexible ferroelectret field-effect transistor systems for large-area sensor skins and microphones, flexible large-array position detectors (touchpad), and stretchable large-array pressure sensors.

Paper Details

Date Published: 10 April 2008
PDF: 10 pages
Proc. SPIE 6927, Electroactive Polymer Actuators and Devices (EAPAD) 2008, 69270Q (10 April 2008); doi: 10.1117/12.779363
Show Author Affiliations
Reinhard Schwödiauer, Johannes Kepler Univ. (Austria)
Ingrid Graz, Johannes Kepler Univ. (Austria)
Martin Kaltenbrunner, Johannes Kepler Univ. (Austria)
Christoph Keplinger, Johannes Kepler Univ. (Austria)
Petr Bartu, Johannes Kepler Univ. (Austria)
Gerda Buchberger, Johannes Kepler Univ. (Austria)
Christoph Ortwein, Johannes Kepler Univ. (Austria)
Siegfried Bauer, Johannes Kepler Univ. (Austria)

Published in SPIE Proceedings Vol. 6927:
Electroactive Polymer Actuators and Devices (EAPAD) 2008
Yoseph Bar-Cohen, Editor(s)

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