Dresden 2009 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 7: Advanced Dielectrics
DF 7.6: Talk
Tuesday, March 24, 2009, 16:00–16:20, WIL A317
Stretchable pressure sensor made of ferroelectret-elastomer-composite and elastic gold electrodes — •Markus Krause1, Ingrid M. Graz1,2, Petr Bartu1, Simona Bauer-Gogonea1, Sigurd Wagner3, Stéphanie P. Lacour2, and Siegfried Bauer1 — 1Soft Matter Physics, Johannes Kepler University, Linz, Austria — 2Nanoscience Centre, Dept. Of Engineering, University of Cambridge, Cambridge, U.K. — 3Department of Electrical Engineering, Princeton University, Princeton, NJ, USA
Stretchable electronics recently emerged as a new area of macroelectronics, with applications in consumer goods, mobile appliances and artificial skin for full body tactile sensors. Challenges in research are the development of stretchable sensing materials, capable of recording changes in physical parameters such as temperature or pressure. Here we describe a reversibly stretchable pressure sensor material, where charged polypropylene ferroelectret foams as pressure-sensitive part are embedded in a 1mm thick matrix of a surface microstructured silicone elastomer. For electrical readout, 75 nm thick elastic gold electrodes were evaporated on it. The sensor was fabricated and tested as standalone system and combined with an a-Si:H TFT. Modulations in the source-drain-current reflect the periodically applied pressure signal. Pressure in a range from 10 to 1000 kPa was detected, while the sensor was uniaxially streched up to 40%. The signal remained stable over the described pressure and stretch ranges and is even high enough to switch the TFT from the OFF to the ON-state. Financial support of the work from the FWF is gratefully acknowledged.