TSD currents in corona poled FEP/ePTFE/FEP sandwiches

Author

von Seggern, H. ; Fedosov, S.N. ; Zhukov, S.

Author_Institution

Inst. of Mater. Sci., Darmstadt Univ. of Technol., Darmstadt

fYear

2008

fDate

15-17 Sept. 2008

Abstract

Sandwich structures consisting of porous PTFE films clamped between two FEP Teflon films show large quasi- static piezoelectric coefficients due to high residual polarization formed by breakdown charges trapped at the interfaces between the two dielectrics. At the same time, the stability of polarization and the piezocoefficient is limited by rather high mobility of positive charges in FEP films. Intention to increase the stability of the positive charge in FEP by high temperature treatment during poling has been tested in this paper by comparing relaxation and thermal behavior of sandwich piezoelectrets poled at different temperatures from 25 to 150 degC.

Keywords

composite material interfaces; corona; dielectric thin films; piezoelectric materials; polymer films; porous materials; sandwich structures; thermally stimulated currents; FEP Teflon films; TSD currents; breakdown charges; corona poled FEP/ePTFE/FEP sandwiches; dielectric interfaces; piezocoefficient; porous PTFE films; quasistatic piezoelectric coefficients; sandwich structures; thermally stimulated discharge current; Corona; Current measurement; Materials science and technology; Metallization; Physics; Piezoelectric films; Piezoelectric polarization; Sandwich structures; Temperature; Thermal stability;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 2008. ISE-13. 13th International Symposium on

Conference_Location

Tokyo

Print_ISBN

978-1-4244-1850-3

Electronic_ISBN

978-1-4244-1851-0

Type

conf

DOI

10.1109/ISE.2008.4814023

Filename

4814023