Solvent Treatment of Wet-Spun PEDOT: PSS Fibers for Fiber-Based Wearable pH Sensing

Reid, Daniel O., Smith, Rachel, Garcia-Torres, Jose, Watts, John J. and Crean, Carol (2019) Solvent Treatment of Wet-Spun PEDOT: PSS Fibers for Fiber-Based Wearable pH Sensing Sensors, 19 (19), 4213. pp. 1-10.

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Abstract

There is a growing desire for wearable sensors in health applications. Fibers are inherently flexible and as such can be used as the electrodes of flexible sensors. Fiber-based electrodes are an ideal format to allow incorporation into fabrics and clothing and for use in wearable devices. Electrically conducting fibers were produced from a dispersion of poly (3,4-ethylenedioxythiophene)-poly (styrenesulfonate) (PEDOT: PSS). Fibers were wet spun from two PEDOT: PSS sources, in three fiber diameters. The effect of three different chemical treatments on the fibers were investigated and compared. Short 5 min treatment times with dimethyl sulfoxide (DMSO) on 20 μm fibers produced from Clevios PH1000 were found to produce the best overall treatment. Up to a six-fold increase in electrical conductivity was achieved, reaching 800 S cm−1, with no loss of mechanical strength (150 MPa). With a pH-sensitive polyaniline coating, these fibers displayed a Nernstian response across a pH range of 3.0 to 7.0, which covers the physiologically critical pH range for skin. These results provide opportunities for future wearable, fiber-based sensors including real-time, on-body pH sensing to monitor skin disease.

Item Type:	Article
Divisions :	Faculty of Engineering and Physical Sciences > Chemistry
Authors :	Name Email ORCID Reid, Daniel O. d.reid@surrey.ac.uk Smith, Rachel r.drinkwater@surrey.ac.uk Garcia-Torres, Jose Watts, John J. J.Watts@surrey.ac.uk Crean, Carol c.crean@surrey.ac.uk
Date :	28 September 2019
Funders :	Engineering and Physical Sciences Research Council (EPSRC)
DOI :	10.3390/s19194213
Grant Title :	Advanced fibre-based energy storage for wearable applications
Copyright Disclaimer :	© 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Uncontrolled Keywords :	PEDOT: PSS; Fiber electrode; Wearable sensor; pH
Depositing User :	Clive Harris
Date Deposited :	17 Oct 2019 13:21
Last Modified :	17 Oct 2019 13:21
URI:	http://epubs.surrey.ac.uk/id/eprint/852948

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