Template-based fluoroethylenepropylene piezoelectrets with tubular channels for transducer applications
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
17/04/2012
17/04/2012
2009
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Resumo |
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 degrees 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. d(33) 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 degrees 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 system, flexibility, and versatility of the soft ferroelectrets, and a large potential for device applications e.g., in the areas of biomedicine, communications, production engineering, sensor systems, environmental monitoring, etc. Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Brazil (DAAD) Deutscher Akademischer Austausch Dienst, Germany University of Potsdam, Germany Deutsche Forschungsgemeinschaft (DFG)[QI 65/1-1] |
Identificador |
JOURNAL OF APPLIED PHYSICS, v.106, n.1, 2009 0021-8979 http://producao.usp.br/handle/BDPI/14668 10.1063/1.3159039 |
Idioma(s) |
eng |
Publicador |
AMER INST PHYSICS |
Relação |
Journal of Applied Physics |
Direitos |
openAccess Copyright AMER INST PHYSICS |
Palavras-Chave | #discharges (electric) #electrets #materials preparation #piezoelectric thin films #polymer films #sensors #transducers #FERROELECTRET FILMS #CELLULAR POLYMERS #ELECTRET FILMS #FOAMS #Physics, Applied |
Tipo |
article original article publishedVersion |