Abstract

In this work, we have successfully developed a flexible, lightweight, and washable strain and moisture sensor textile fabric by printing poly(3,4-ethylenedioxythiophene) polystyrene sulfonate/polydimethylsiloxane-b-polyethylene oxide (PEDOT:PSS/PDMS) conductive polymer composite on knitted cotton fabric. A 60.2 kΩ/sq surface resistance has been obtained at a 30% ratio of PDMS to PEDOT:PSS at 0.012 g/cm2 solid add-on. The coated fabric was washed at 30 °C for 30 min in the presence of a standard detergent. It was observed that there was a 5.3% increase in surface resistance, i.e., 63.4 kΩ/sq. After coating, the fabric could still be stretched up to the infliction elongation of the fabric, i.e., 40%, with a significant change in surface resistance that makes it usable as a strain sensor. In addition, the conductive fabric showed a drop in surface resistance with an increase of the moisture regain up to 150%.

Highlights

  • Textile materials are required to possess supplementary functionalities in addition to the standard comfort and durability capabilities, in line with the phenomenal growth of electronics and computing on the go [1,2]

  • A dispersion solution of PEDOT:PSS was applied to a low-density polyethylene (LDPE) to produce a conductive LDPE that showed an electromechanical response during stretch

  • A high conductive grade poly(3,4-ethylenedioxythiophene) polystyrene sulfonate PH 1000 (PEDOT:PSS PH 1000) polymer obtained from Ossila, UK and polydimethylsiloxane-b-polyethylene oxide, methyl terminated (PDMS-b-PEO) elastomer obtained from

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Summary

Introduction

Textile materials are required to possess supplementary functionalities in addition to the standard comfort and durability capabilities, in line with the phenomenal growth of electronics and computing on the go [1,2]. Textile articles have attained all-embracing demand to construct flex, stretchy, and washable hardware in different domains such as an electrocardiograph (ECG) sensor [3], an antenna [4], and an energy harvesting device reported [5]. A textile-based strain sensor based on poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) was reported by Zein et al [6]. A dispersion solution of PEDOT:PSS was applied to a low-density polyethylene (LDPE) to produce a conductive LDPE that showed an electromechanical response during stretch. We selected a biocompatible elastomer instead of the silicon, as well as a hydrophilic knitted cotton fabric, which make it suitable for wearable application. A PEDOT:PSS-based humidity sensor was reported at the IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting [7]. Only PEDOT:PSS was used; the flexibility was compromised.

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