Poling and characterization of piezoelectric polymer fibers for use in textile sensors

Nilsson, Erik; Lund, Anja; Jonasson, Christian; Johansson, Christer; Hagström, Bengt

doi:10.1016/j.sna.2013.08.011

Cited by 112 publications

(94 citation statements)

References 28 publications

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“…The power density of our fibers is 30.7 μW/gfiber. Results from our previous study, where single piezoelectric yarn was characterized the available mean power was theoretically estimated to 44 μW/gfiber [8]. Thus, there is difference between the amounts of strain applied in the two different cases.…”

Section: Discussionmentioning

confidence: 95%

“…1 shows the fibers sheath core structure. Fibers were cold drawn with a solid state draw ratio (SSDR) of 4 assuring the conversion of unpolar α crystal phase to the polar β phase in the PVDF sheath [8]. Fibers core was interconnected by fusion welding of fiber ends between two thin sheets of electrical conductive soft thermoplastic elastomer.…”

Section: Manufacturing Piezoelectric Fibersmentioning

confidence: 99%

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Energy Harvesting from Piezoelectric Textile Fibers

Nilsson

Mateu

Spies

et al. 2014

Procedia Engineering

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Section: Discussionmentioning

confidence: 95%

Section: Manufacturing Piezoelectric Fibersmentioning

confidence: 99%

Energy Harvesting from Piezoelectric Textile Fibers

Nilsson

Mateu

Spies

et al. 2014

Procedia Engineering

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“…A voltage of −10 kV was applied through the needles during 5 minutes before both heat and voltage were turned off and the sample was allowed to cool to room temperature before removal from the oven. This procedure was shown to be sufficient to orient the dipoles by Nilsson et al 2013.…”

Section: Polingmentioning

confidence: 99%

Textile piezoelectric sensors – melt spun bi-component poly(vinylidene fluoride) fibres with conductive cores and poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) coating as the outer electrode

Åkerfeldt

Nilsson

Gillgard³

et al. 2014

Fashion and Textiles

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Textile piezoelectric sensors -melt spun bi-component poly(vinylidene fluoride) fibres with conductive cores and poly (3,4- AbstractThe work presented here addresses the outer electroding of a fully textile piezoelectric strain sensor, consisting of bi-component fibre yarns of β-crystalline poly(vinylidene fluoride) (PVDF) sheath and conductive high density polyethylene (HDPE)/carbon black (CB) core as insertions in a woven textile, with conductive poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS) coatings developed for textile applications. Two coatings, one with a polyurethane binder and one without, were compared for the application and evaluated as electrode material in piezoelectric testing, as well as tested for surface resistivity, tear strength, abrasion resistance and shear flexing. Both coatings served their function as the outer electrodes in the system and no difference in this regard was detected between them. Omission of the binder resulted in a surface resistivity one order of magnitude less, of 12.3 Ω/square, but the surface resistivity of these samples increased more upon abrasion than the samples coated with binder. The tear strength of the textile coated with binder decreased with one third compared to the uncoated substrate, whereas the tear strength of the coated textile without binder increased with the same amount. Surface resistivity measurements and scanning electron microscopy (SEM) images of the samples subjected to shear flexing showed that the coatings without the binder did not withstand this treatment, and that the samples with the binder managed this to a greater extent. In summary, both of the PEDOT:PSS coatings could be used as outer electrodes of the piezoelectric fibres, but inclusion of binder was found necessary for the durability of the coating.

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“…Some qualifications, such as durability, shock resistance, withstanding millions of flexing cycles, biocompatibility and functionality in harsh and biological environments, make piezofilm a perfect candidate for vital signs monitoring such as heart beat rate and respiration rate [34]. Some examples of the applications are documented in various studies [25,30,32,35,36].…”

Section: Introductionmentioning

confidence: 99%

Piezofilm yarn sensor-integrated knitted fabric for healthcare applications

Atalay

Husain

et al. 2016

Journal of Industrial Textiles

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Continuous measurement of cardio-respiratory signals offers various kinds of information valuable for the diagnosis of disease and management of the disease process. The article reports the development of the Piezofilm yarn sensor for healthcare applications, and investigates its performance by monitoring cardio-respiratory signals of human body over an extended period of time. Piezofilm yarn sensor was developed by embedding the thin PVDF strips within the textile yarn. The working mechanism of the Piezofilm yarn sensor is based on voltage generation due to the applied stress. In order to deploy the Piezofilm yarn sensor in the application environment, it was integrated into the knitted textile fabric and then sewn to form belt to be placed at the chest wall and wrist area. The raw signals were acquired through the Piezofilm lab amplifier, National Instrument data acquisition device and SignalExpress software. Fast Fourier Transform analysis was performed to calculate the average cardio-respiratory signal frequencies. Based on Fast Fourier Transform analysis, an additional signalprocessing step was added to eliminate the unwanted mechanical interference and body signals by using an Infinite Impulse Response band pass filter. The Piezofilm yarn sensor embedded sensing fabric was able to measure both respiratory rate and heart beat rate under static and dynamic conditions. The wrist area measurements for heart beat signals were found to be more uniform in comparison to the chest area measurements. Apart from the general healthcare, this sensing fabric could also be used in studies related to biorhythms, sports, detection of sleep apnea and heart problems.

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Poling and characterization of piezoelectric polymer fibers for use in textile sensors

Cited by 112 publications

References 28 publications

Energy Harvesting from Piezoelectric Textile Fibers

Energy Harvesting from Piezoelectric Textile Fibers

Textile piezoelectric sensors – melt spun bi-component poly(vinylidene fluoride) fibres with conductive cores and poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) coating as the outer electrode

Piezofilm yarn sensor-integrated knitted fabric for healthcare applications

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