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Tubular fluoropolymer arrays with high piezoelectric response

Zhukov, Sergey and Eder-Goy, Dagmar and Biethan, Corinna and Fedosov, Sergey and Xu, Bai-Xiang and von Seggern, Heinz (2018):
Tubular fluoropolymer arrays with high piezoelectric response.
In: Smart Materials and Structures, IOP Science, pp. 015010, 27, (1), ISSN 0964-1726, 1361-665X, DOI: 10.1088/1361-665X/aa9a63, [Article]

Abstract

Polymers with electrically charged internal air cavities called ferroelectrets exhibit a pronounced piezoelectric effect and are regarded as soft functional materials suitable for sensor and actuator applications. In this work, a simple method for fabricating piezoelectret arrays with open-tubular channels is introduced. A set of individual fluoroethylenepropylene (FEP) tubes is compressed between two heated metal plates. The squeezed FEP tubes are melted together at +270 °C. The resulting structure is a uniform, multi-tubular, flat array that reveals a strong piezoelectric response after a poling step. The fabricated arrays have a high ratio between piezoelectrically active and non-active areas. The optimal charging voltage and stability of the piezoelectric coefficients with pressures and frequency were experimentally investigated for two specific array structures with wall thickness of 50 and 120 μm. The array fabricated from 50 μm thick FEP tubes reveals a stable and high piezoelectric coefficient of ${d}_{33}$ = 120–160 pC N−1 with a flat frequency response between 0.1 Hz and 10 kHz for pressures between 1 and 100 kPa. An increase of wall thickness to 120 μm is accompanied by a more than twofold decrease in the piezoelectric coefficient as a result of a simultaneously higher effective array stiffness and lower remanent polarization. The obtained experimental results can be used to optimize the array design with regard to the electromechanical performance.

Item Type: Article
Erschienen: 2018
Creators: Zhukov, Sergey and Eder-Goy, Dagmar and Biethan, Corinna and Fedosov, Sergey and Xu, Bai-Xiang and von Seggern, Heinz
Title: Tubular fluoropolymer arrays with high piezoelectric response
Language: English
Abstract:

Polymers with electrically charged internal air cavities called ferroelectrets exhibit a pronounced piezoelectric effect and are regarded as soft functional materials suitable for sensor and actuator applications. In this work, a simple method for fabricating piezoelectret arrays with open-tubular channels is introduced. A set of individual fluoroethylenepropylene (FEP) tubes is compressed between two heated metal plates. The squeezed FEP tubes are melted together at +270 °C. The resulting structure is a uniform, multi-tubular, flat array that reveals a strong piezoelectric response after a poling step. The fabricated arrays have a high ratio between piezoelectrically active and non-active areas. The optimal charging voltage and stability of the piezoelectric coefficients with pressures and frequency were experimentally investigated for two specific array structures with wall thickness of 50 and 120 μm. The array fabricated from 50 μm thick FEP tubes reveals a stable and high piezoelectric coefficient of ${d}_{33}$ = 120–160 pC N−1 with a flat frequency response between 0.1 Hz and 10 kHz for pressures between 1 and 100 kPa. An increase of wall thickness to 120 μm is accompanied by a more than twofold decrease in the piezoelectric coefficient as a result of a simultaneously higher effective array stiffness and lower remanent polarization. The obtained experimental results can be used to optimize the array design with regard to the electromechanical performance.

Journal or Publication Title: Smart Materials and Structures
Volume: 27
Number: 1
Publisher: IOP Science
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Electronic Materials
11 Department of Materials and Earth Sciences > Material Science > Mechanics of functional Materials
11 Department of Materials and Earth Sciences
Date Deposited: 22 Jan 2018 11:35
DOI: 10.1088/1361-665X/aa9a63
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