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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
University of Borås, Swedish School of Textiles. (Textile Materials Technology)
University of Borås, Swedish School of Textiles.
University of Borås, Swedish School of Textiles.
University of Borås, Swedish School of Textiles. (Textile Materials Technology)
2014 (English)In: Fashion and Textiles, ISSN 2198-0802, Vol. 1, no 13Article in journal (Refereed)
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

The 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.

Place, publisher, year, edition, pages
SpringerOpen , 2014. Vol. 1, no 13
Keyword [en]
Textile technology
National Category
Other Materials Engineering Materials Engineering
Research subject
Textiles and Fashion (General)
Identifiers
URN: urn:nbn:se:hb:diva-1919DOI: 10.1186/s40691-014-0013-6Local ID: 2320/14287OAI: oai:DiVA.org:hb-1919DiVA: diva2:869997
Note

Sponsorship:

Sparbanksstiftelsen Sjuhärad, Smart Textiles (VINNOVA)

Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2015-12-18
In thesis
1. Electrically conductive textile coatings with PEDOT:PSS
Open this publication in new window or tab >>Electrically conductive textile coatings with PEDOT:PSS
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In smart textiles, electrical conductivity is often required for several functions, especially contacting (electroding) and interconnecting. This thesis explores electrically conductive textile surfaces made by combining conventional textile coating methods with the intrinsically conductive polymer complex poly(3,4-ethylene dioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS).

PEDOT:PSS was used in textile coating formulations including polymer binder, ethylene glycol (EG) and rheology modifier. Shear viscometry was used to identify suitable viscosities of the formulations for each coating method. The coating methods were knife coating, pad coating and screen printing. The first part of the work studied the influence of composition of the coating formulation, the amount of coating and the film formation process on the surface resistivity and the surface appearance of knife-coated textiles. The electrical resistivity was largely affected by the amount of PEDOT:PSS in the coating and indicated percolation behaviour within the system. Addition of a high-boiling solvent, i.e. EG, decreased the surface resistivity with more than four orders of magnitude. Studies of tear strength and bending rigidity showed that textiles coated with formulations containing larger amounts of PEDOT:PSS and EG were softer, more ductile and stronger than those coated with formulations containing more binder. The coated textiles were found to be durable to abrasion and cyclic strain, as well as quite resilient to the harsh treatment of shear flexing. Washing increased the surface resistivity, but the samples remained conductive after five wash cycles.

The second part of the work focused on using the coatings to transfer the voltage signal from piezoelectric textile fibres; the coatings were first applied using pad coating as the outer electrode on a woven sensor and then as screen-printed interconnections in a sensing glove based on stretchy, warp-knitted fabric. Sensor data from the glove was successfully used as input to a microcontroller running a robot gripper. These applications showed the viability of the concept and that the coatings could be made very flexible and integrated into the textile garment without substantial loss of the textile characteristics. The industrial feasibility of the approach was also verified through the variations of coating methods.

Place, publisher, year, edition, pages
Borås: Högskolan i Borås, 2015. 46 p.
Series
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 56
Keyword
textile coating, conductive coating, conjugated polymers, ICP, PEDOT:PSS, textile properties, textile sensor, printed electronics, Smart textiles, poly(3, 4-ethylene dioxythiophene)-poly(styrene sulfonate)
National Category
Engineering and Technology
Research subject
Textiles and Fashion (General)
Identifiers
urn:nbn:se:hb:diva-19 (URN)9789187525391 (ISBN)9789187525407 (ISBN)
Public defence
2015-03-23, T154, The Swedish School of Textiles, Skaraborgsvägen 3A, Borås, 13:00 (English)
Opponent
Available from: 2015-05-19 Created: 2015-02-16 Last updated: 2015-12-18Bibliographically approved

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