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

Zhukov, Sergey ; Fedosov, Sergey ; Seggern, Heinz von (2011)
Piezoelectrets from sandwiched porous polytetrafluoroethylene (ePTFE) films: influence of porosity and geometry on charging properties.
In: Journal of Physics D: Applied Physics, 44 (10)
doi: 10.1088/0022-3727/44/10/105501
Article, Bibliographie

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 ; Fedosov, Sergey ; Seggern, Heinz von
Type of entry: Bibliographie
Title: Piezoelectrets from sandwiched porous polytetrafluoroethylene (ePTFE) films: influence of porosity and geometry on charging properties
Language: English
Date: 23 February 2011
Publisher: IOP Publishing
Journal or Publication Title: Journal of Physics D: Applied Physics
Volume of the journal: 44
Issue Number: 10
DOI: 10.1088/0022-3727/44/10/105501
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.

Uncontrolled Keywords: electrical, magnetic and optical, surfaces, interfaces and thin films
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Electronic Materials
Date Deposited: 14 Oct 2013 08:46
Last Modified: 13 Aug 2021 14:08
PPN:
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.
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