| Autor: |
Altafim, Ruy Alberto Pisani, Qiu, Xunlin, Wirges, Werner, Gerhard, Reimund, Altafim, Ruy Alberto Corrêa, Basso, Heitor Cury, Jenninger, Werner, Wagner, Joachim |
| Předmět: |
|
| Zdroj: |
Journal of Applied Physics; Jul2009, Vol. 106 Issue 1, p14106-14111, 5p, 1 Color Photograph, 2 Diagrams, 3 Graphs |
| Abstrakt: |
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 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
