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Textile-Based Potentiometric Electrochemical pH Sensor for Wearable Applications.
Libu Manjakkal1, Wenting Dang2, Nivasan Yogeswaran3
1Bendable Electronics and Sensing Technology Group, School of Engineering, University of Glasgow, Glasgow G128QQ, UK. Libu.Manjakkal@glasgow.ac.uk.
Biosensors
|January 19, 2019
Summary
We developed a washable potentiometric pH sensor using printed electrodes on fabric for wearable tech. This reliable electrochemical sensor offers a fast response and stable readings, even after washing.
Area of Science:
- Electrochemistry
- Materials Science
- Wearable Technology
Background:
- Wearable sensors require robust and washable designs.
- Textile-based electrochemical sensors offer a promising avenue for integration into clothing.
- Existing pH sensors often lack durability for real-world wearable applications.
Purpose of the Study:
- To develop and characterize a novel potentiometric pH sensor integrated onto a textile substrate.
- To evaluate the sensor's electrochemical performance, stability, and washability for wearable applications.
Main Methods:
- Printing sensitive (thick film graphite composite) and reference (Ag/AgCl) electrodes onto a cellulose-polyester blend cloth.
- Utilizing potentiometry, cyclic voltammetry, and electrochemical impedance spectroscopy to analyze sensor performance.
- Assessing sensor response, stability, and performance after washing.
Main Results:
- The textile-based pH sensor demonstrated excellent adhesion and washability with a reliable pH response.
- Electrochemical analysis confirmed the sensor operates via electrochemical reactions, including double-layer formation and ionic exchange.
- Potentiometric measurements showed a sensitivity of 4 mV/pH and a rapid response time of 5 s within the pH range of 6-9.
- The sensor maintained a stable potential (47 ± 2 mV) for 2000 s, even after washing.
Conclusions:
- The developed textile-based potentiometric pH sensor is suitable for wearable applications due to its robustness, washability, and stable electrochemical performance.
- This work highlights the potential of printed electronics on textiles for creating durable and functional wearable sensing devices.
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