High performance piezoelectric devices based on aligned arrays of nanofibers of poly(vinylidenefluoride-co-trifluoroethylene)

Luana Persano, Canan Dagdeviren, Yewang Su, Yihui Zhang, Salvatore Girardo, Dario Pisignano, Yonggang Huang and John A. Rogers ()
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Luana Persano: National Nanotechnology Laboratory of Istituto Nanoscienze-CNR
Canan Dagdeviren: Frederick Seitz Materials Research Laboratory, and Beckman Institute for Advanced Science, University of Illinois at Urbana-Champaign
Yewang Su: Center for Mechanics and Materials, Tsinghua University
Yihui Zhang: Center for Mechanics and Materials, Tsinghua University
Salvatore Girardo: National Nanotechnology Laboratory of Istituto Nanoscienze-CNR
Dario Pisignano: National Nanotechnology Laboratory of Istituto Nanoscienze-CNR
Yonggang Huang: Northwestern University
John A. Rogers: Frederick Seitz Materials Research Laboratory, and Beckman Institute for Advanced Science, University of Illinois at Urbana-Champaign

Nature Communications, 2013, vol. 4, issue 1, 1-10

Abstract: Abstract Multifunctional capability, flexible design, rugged lightweight construction and self-powered operation are desired attributes for electronics that directly interface with the human body or with advanced robotic systems. For these applications, piezoelectric materials, in forms that offer the ability to bend and stretch, are attractive for pressure/force sensors and mechanical energy harvesters. Here, we introduce a large area, flexible piezoelectric material that consists of sheets of electrospun fibres of the polymer poly[(vinylidenefluoride-co-trifluoroethylene]. The flow and mechanical conditions associated with the spinning process yield free-standing, three-dimensional architectures of aligned arrangements of such fibres, in which the polymer chains adopt strongly preferential orientations. The resulting material offers exceptional piezoelectric characteristics, to enable ultra-high sensitivity for measuring pressure, even at exceptionally small values (0.1 Pa). Quantitative analysis provides detailed insights into the pressure sensing mechanisms, and establishes engineering design rules. Potential applications range from self-powered micro-mechanical elements, to self-balancing robots and sensitive impact detectors.

Date: 2013
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DOI: 10.1038/ncomms2639

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