Journal ArticleDOI
Template-based fluoroethylenepropylene piezoelectrets with tubular channels for transducer applications
Ruy Alberto Pisani Altafim,Xunlin Qiu,Werner Wirges,Reimund Gerhard,Ruy Alberto Corrêa Altafim,H.C. Basso,Werner Jenninger,Joachim Wagner +7 more
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TLDR
In this paper, two fluoroethylenepropylene (FEP) films with good electret properties are laminated around a specifically designed and prepared polytetrafluoroethylene (PTFE) template at 300°C.Abstract:
We describe the concept, the fabrication, and the most relevant properties of a piezoelectric-polymer system: Two fluoroethylenepropylene (FEP) films with good electret properties are laminated around a specifically designed and prepared polytetrafluoroethylene (PTFE) template at 300 °C. After removing the PTFE template, a two-layer FEP film with open tubular channels is obtained. For electric charging, the two-layer FEP system is subjected to a high electric field. The resulting dielectric barrier discharges inside the tubular channels yield a ferroelectret with high piezoelectricity. d33 coefficients of up to 160 pC/N have already been achieved on the ferroelectret films. After charging at suitable elevated temperatures, the piezoelectricity is stable at temperatures of at least 130 °C. Advantages of the transducer films include ease of fabrication at laboratory or industrial scales, a wide range of possible geometrical and processing parameters, straightforward control of the uniformity of the polymer ...read more
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Patterned piezo-, pyro-, and ferroelectricity of poled polymer electrets
TL;DR: In this article, a new class of polymer materials has been added to this family: internally charged cellular space-charge polymer electrets (so-called “ferroelectrets”), whose piezoelectricity can be orders of magnitude higher than that of conventional ferroelectric polymers.
Journal ArticleDOI
A Review of Acoustic Impedance Matching Techniques for Piezoelectric Sensors and Transducers.
TL;DR: This article presents standard methods to match the acoustic impedance of the piezoelectric sensors, actuators, and transducers with the surrounding wave propagation media.
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Piezoelectrets for wearable energy harvesters and sensors
TL;DR: In this paper, a review of piezoelectric materials for wearable energy harvesting and human physiological signal monitoring is presented, and the perspectives and challenges of the traditional PAs with unique designs are discussed.
Journal ArticleDOI
Vibration-based energy harvesting with stacked piezoelectrets
TL;DR: In this article, a multi-layer piezoelectrical energy harvester with nine layers and a seismic mass of 8.5 g was presented, achieving power levels of 0.1 to 1 mW with an input acceleration of 1g.
Journal ArticleDOI
Ferroelectret nanogenerator with large transverse piezoelectric activity
TL;DR: In this paper, a piezoelectric energy harvester consisting of specially designed ferroelectrets based on fluorocarbon polymers that have very large low-frequency transverse piezer coefficients g31 = 3.0 Vm/N was presented.
References
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Dielectric-barrier Discharges: Their History, Discharge Physics, and Industrial Applications
TL;DR: In this article, the authors discuss the history, discharge physics, and plasma chemistry of dielectric-barrier discharges and their applications and discuss the applications of these discharges.
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Ferroelectrets: Soft Electroactive Foams for Transducers
TL;DR: After certain cellular polymers are internally charged, they behave like soft and sensitive piezoelectrics that can be used to interconvert acoustical or mechanical signals and electrical signals.
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Conference on Electrical Insulation and Dielectric Phenomena
TL;DR: The discovery and development of manmade polymer materials dates from the pioneering works of Goodyear (vulcanized rubber) and Hyatt (celluloid plastics) in the mid-nienteenth century, and to Baekeland (Phenol-formaldehyde resins) at the beginning of this century, the remarkable growth of the synthetic fiber, rubber, and plastics industries followed the preparative achievements of the I.C.I.
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Electromechanical response of cellular electret films
TL;DR: In this article, the direct and inverse electromechanical transducer constants of polypropylene polyethylene (polypropylene) films with a cellular structure were measured and explained with a theoretical model.
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Microstorms in Cellular Polymers: A Route to Soft Piezoelectric Transducer Materials with Engineered Macroscopic Dipoles
Michael Wegener,Siegfried Bauer +1 more
TL;DR: An overview is provided on the preparation of cellular polymers by physical foaming, on their charging by "microstorms", on their piezo- and pyroelectricity, and on analogies to ferroelectrics.