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Textile based ferroelectret for foot pressure sensor

Textile based ferroelectret for foot pressure sensor
Textile based ferroelectret for foot pressure sensor

Sensors based on piezoelectric materials like ZnO, lead zirconate titanate (PZT), MoS2, poly (vinylidene fluoride) (PVDF) and its similar copolymer p(vdf-TrFE) have exhibit excellent through converting mechanical signal into electrical output [1-3]. For these conventional piezoelectric materials: PZT and PVDF, PZT possesses excellent dielectric and piezoelectric properties, but is a rigid ceramic with a very high Young's modulus (63 GPa). In contrast, PVDF is a soft polymer with low Young's modulus (2.9 GPa), but its piezoelectric charge coefficient d33 is an order of magnitude lower than of PZT (20 pC/N), which are making they unsuitable for wearable application [4-5]. Therefore, there is the need to develop a piezoelectric material with high piezoelectric activity, low Young's modulus and the ability to stretch and conform for wearable sensing. Ferroelectret is a thin film of polymer foam that can generate electrical signal under mechanical force, which is similar to piezoelectric materials. The typical internal structure of a ferroelectret foam is randomly arranged cellular voids with positive and negative charges stored separately on each surface of the void. Due to the material of the polymer and its cellular structure, the elastic modulus of the ferroelectret is low. The ferroelectret is readily compressible and will undergo large deformation when under a compressive force, which results in a strong piezoelectric effect. Due to its advanced piezoelectric properties in comparison with other piezoelectric materials, numerous applications have been proposed, such as acoustic transducers, high frequency loudspeakers, ultrasonic transmitters and receivers, hydrophones and accelerometers [6]. The soft, flexible nature of the polymer ferroelectret makes it highly suitable for use in wearable sensing applications.

1-3
Institute of Electrical and Electronics Engineers Inc.
Shi, Junjie
3e2ba75e-a773-478a-aacc-5d926bfd1669
Beeby, Steve
ba565001-2812-4300-89f1-fe5a437ecb0d
Shi, Junjie
3e2ba75e-a773-478a-aacc-5d926bfd1669
Beeby, Steve
ba565001-2812-4300-89f1-fe5a437ecb0d

Shi, Junjie and Beeby, Steve (2019) Textile based ferroelectret for foot pressure sensor. In FLEPS 2019 - IEEE International Conference on Flexible and Printable Sensors and Systems, Proceedings. Institute of Electrical and Electronics Engineers Inc. pp. 1-3 . (doi:10.1109/FLEPS.2019.8792228).

Record type: Conference or Workshop Item (Paper)

Abstract

Sensors based on piezoelectric materials like ZnO, lead zirconate titanate (PZT), MoS2, poly (vinylidene fluoride) (PVDF) and its similar copolymer p(vdf-TrFE) have exhibit excellent through converting mechanical signal into electrical output [1-3]. For these conventional piezoelectric materials: PZT and PVDF, PZT possesses excellent dielectric and piezoelectric properties, but is a rigid ceramic with a very high Young's modulus (63 GPa). In contrast, PVDF is a soft polymer with low Young's modulus (2.9 GPa), but its piezoelectric charge coefficient d33 is an order of magnitude lower than of PZT (20 pC/N), which are making they unsuitable for wearable application [4-5]. Therefore, there is the need to develop a piezoelectric material with high piezoelectric activity, low Young's modulus and the ability to stretch and conform for wearable sensing. Ferroelectret is a thin film of polymer foam that can generate electrical signal under mechanical force, which is similar to piezoelectric materials. The typical internal structure of a ferroelectret foam is randomly arranged cellular voids with positive and negative charges stored separately on each surface of the void. Due to the material of the polymer and its cellular structure, the elastic modulus of the ferroelectret is low. The ferroelectret is readily compressible and will undergo large deformation when under a compressive force, which results in a strong piezoelectric effect. Due to its advanced piezoelectric properties in comparison with other piezoelectric materials, numerous applications have been proposed, such as acoustic transducers, high frequency loudspeakers, ultrasonic transmitters and receivers, hydrophones and accelerometers [6]. The soft, flexible nature of the polymer ferroelectret makes it highly suitable for use in wearable sensing applications.

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More information

Accepted/In Press date: 8 July 2019
e-pub ahead of print date: 8 August 2019
Venue - Dates: 1st IEEE International Conference on Flexible and Printable Sensors and Systems, FLEPS 2019, Glasgow, United Kingdom, 2019-07-07 - 2019-07-10

Identifiers

Local EPrints ID: 434215
URI: https://eprints.soton.ac.uk/id/eprint/434215
PURE UUID: 6ab41d0b-ce94-48a5-b7b1-3aed196b4c08
ORCID for Steve Beeby: ORCID iD orcid.org/0000-0002-0800-1759

Catalogue record

Date deposited: 17 Sep 2019 16:30
Last modified: 08 Oct 2019 00:54

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Contributors

Author: Junjie Shi
Author: Steve Beeby ORCID iD

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