Title :
Dielectric resonance spectroscopy of piezoelectrets with tubular channels: Channel dimensions control resonances
Author :
Altafim, Ruy Alberto Pisani ; Basso, Heitor Cury ; Altafim, Ruy Alberto Correa ; Wirges, Werner ; Qiu, Xunlin ; Gerhard, Reimund ; Jenninger, Werner ; Wagner, Joachin
Author_Institution :
Dept. of Electr. Eng., Univ. of Sao Paulo, Sao Carlos, Brazil
Abstract :
Recently, a new type of polymeric piezoelectret has been proposed and demonstrated with two fluoroethylenepropy-lene (FEP) films that are laminated around a polytetrafluoroethy-lene (PTFE) template at 300°C. After removing the PTFE template, a two-layer FEP film with open tubular channels is obtained. After internal bipolar charging, the channels form large and easily deformable electric dipoles that lead to the desired piezoelectricity. By using different templates, the channel dimensions and consequently also the resonances of the piezo-electret system can be easily tuned. Here, we describe and discuss the resonance peaks that are found in the dielectric spectra of tubular-channel piezoelectrets with different channel geometries.
Keywords :
dielectric resonance; piezoelectric materials; piezoelectricity; polymer films; thin films; deformable electric dipoles; dielectric resonance spectroscopy; dielectric spectra; fluoroethylenepropylene films; internal bipolar charging; polymeric piezoelectret; polytetrafluoroethylene template; temperature 300 degC; tubular channels; Dielectrics; Piezoelectricity; Polymers; Resonant frequency; Spectroscopy; Stress; Thermal stability;
Conference_Titel :
Solid Dielectrics (ICSD), 2010 10th IEEE International Conference on
Conference_Location :
Potsdam
Print_ISBN :
978-1-4244-7945-0
Electronic_ISBN :
978-1-4244-7943-6
DOI :
10.1109/ICSD.2010.5568034
