TU Darmstadt / ULB / TUbiblio

Piezoelectrets from sandwiched porous polytetrafluoroethylene (ePTFE) films: influence of porosity and geometry on charging properties

Zhukov, Sergey and Fedosov, Sergey and von Seggern, Heinz (2011):
Piezoelectrets from sandwiched porous polytetrafluoroethylene (ePTFE) films: influence of porosity and geometry on charging properties.
In: Journal of Physics D: Applied Physics, IOP Publishing, p. 105501, 44, (10), ISSN 0022-3727, [Online-Edition: http://dx.doi.org/10.1088/0022-3727/44/10/105501],
[Article]

Abstract

Sandwiched structures of open-porous and solid polymer dielectrics reveal a strong piezoelectric response after proper charging by high electric fields. Here, the electrical properties of corona-poled three-layer FEP/ePTFE/FEP sandwiches are studied theoretically and experimentally with the objective of its possible optimization for the highest piezoelectric activity. Modelling of the charging properties is performed for different sandwich geometries. It is shown that the maximum value of the remanent interface charge density accumulated during poling depends mainly on the ratio of the solid and porous layers thicknesses and on parameter EB, which characterizes the electric breakdown strength of air in the porous layer. EB exhibits specific dependences on porosity and thickness of the porous layer. For a given porous layer EB is independent of the solid film thickness. The obtained results can be utilized to further optimize the sandwich structure as an electromechanically active device.

Item Type: Article
Erschienen: 2011
Creators: Zhukov, Sergey and Fedosov, Sergey and von Seggern, Heinz
Title: Piezoelectrets from sandwiched porous polytetrafluoroethylene (ePTFE) films: influence of porosity and geometry on charging properties
Language: English
Abstract:

Sandwiched structures of open-porous and solid polymer dielectrics reveal a strong piezoelectric response after proper charging by high electric fields. Here, the electrical properties of corona-poled three-layer FEP/ePTFE/FEP sandwiches are studied theoretically and experimentally with the objective of its possible optimization for the highest piezoelectric activity. Modelling of the charging properties is performed for different sandwich geometries. It is shown that the maximum value of the remanent interface charge density accumulated during poling depends mainly on the ratio of the solid and porous layers thicknesses and on parameter EB, which characterizes the electric breakdown strength of air in the porous layer. EB exhibits specific dependences on porosity and thickness of the porous layer. For a given porous layer EB is independent of the solid film thickness. The obtained results can be utilized to further optimize the sandwich structure as an electromechanically active device.

Journal or Publication Title: Journal of Physics D: Applied Physics
Volume: 44
Number: 10
Publisher: IOP Publishing
Uncontrolled Keywords: electrical, magnetic and optical, surfaces, interfaces and thin films
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Electronic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 14 Oct 2013 08:46
Official URL: http://dx.doi.org/10.1088/0022-3727/44/10/105501
Identification Number: doi:10.1088/0022-3727/44/10/105501
Funders: The authors are grateful to he Hessische Ministerium für Wissenschaft und Kunst through the LOEWE project ‘Adria’ , and to the Deutsche Forschungsgemeinschaft (DFG) through the graduated school of Tunable Integrated Components in Microwave Technology and Optics (TICMO) for financial support.
Export:

Optionen (nur für Redakteure)

View Item View Item