Textile-Based Potentiometric Electrochemical pH Sensor for Wearable Applications

Manjakkal, Libu; Dang, Wenting; Yogeswaran, Nivasan; Dahiya, Ravinder

Abstract

In this work, we present a potentiometric pH sensor on textile substrate for wearable applications. The sensitive (thick film graphite composite) and reference electrodes (Ag/AgCl) are printed on cellulose-polyester blend cloth. An excellent adhesion between printed electrodes allow the textile-based sensor to be washed with a reliable pH response. The developed textile-based pH sensor works on the basis of electrochemical reaction, as observed through the potentiometric, cyclic voltammetry (100 mV/s) and electrochemical impedance spectroscopic (10 mHz to 1 MHz) analysis. The electrochemical double layer formation and the ionic exchanges of the sensitive electrode-pH solution interaction are observed through the electrochemical impedance spectroscopic analysis. Potentiometric analysis reveals that the fabricated textile-based sensor exhibits a sensitivity (slope factor) of 4 mV/pH with a response time of 5 s in the pH range 6–9. The presented sensor shows stable response with a potential of 47 ± 2 mV for long time (2000 s) even after it was washed in tap water. These results indicate that the sensor can be used for wearable applications.

Citation

Manjakkal, L., Dang, W., Yogeswaran, N., & Dahiya, R. (2019). Textile-Based Potentiometric Electrochemical pH Sensor for Wearable Applications. Biosensors, 9(1), Article 14. https://doi.org/10.3390/bios9010014

• Journal Article Type: Article
• Acceptance Date: Jan 15, 2019
• Online Publication Date: Jan 16, 2019
• Publication Date: 2019
• Deposit Date: Jul 19, 2022
• Publicly Available Date: Jul 20, 2022
• Journal: Biosensors
• Electronic ISSN: 2079-6374
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 1
• Article Number: 14
• DOI: https://doi.org/10.3390/bios9010014
• Keywords: pH sensor; e-textile; potentiometric; graphite; wearable system
• Public URL: http://researchrepository.napier.ac.uk/Output/2890663