Stretchable wireless system for sweat pH monitoring

Dang, Wenting; Manjakkal, Libu; Navaraj, William Taube; Lorenzelli, Leandro; Vinciguerra, Vincenzo; Dahiya, Ravinder

Abstract

Sensor-laden wearable systems that are capable of providing continuous measurement of key physiological parameters coupled with data storage, drug delivery and feedback therapy have attracted huge interest. Here we report a stretchable wireless system for sweat pH monitoring, which is able to withstand up to 53% uniaxial strain and more than 500 cycles to 30% strain. The stretchability of the pH sensor patch is provided by a pair of serpentine-shaped stretchable interconnects. The pH sensing electrode is made of graphite-polyurethane composite, which is suitable for biosensor application. The sensing patch validated through in-depth electrochemical studies, exhibits a pH sensitivity of 11.13 ± 5.8 mV/pH with a maximum response time of 8 s. Interference study of ions and analyte (Na+, K+ and glucose) in test solutions shows negligible influence on the pH sensor performance. The pH data can be wirelessly and continuously transmitted to smartphone through a stretchable radio-frequency-identification antenna, of which the radiating performance is stable under 20% strain, as proved by vector network analyzer measurement. To evaluate the full system, the pH value of a human sweat equivalent solution has been measured and wirelessly transmitted to a custom-developed smart phone App.

Citation

Dang, W., Manjakkal, L., Navaraj, W. T., Lorenzelli, L., Vinciguerra, V., & Dahiya, R. (2018). Stretchable wireless system for sweat pH monitoring. Biosensors and Bioelectronics, 107, 192-202. https://doi.org/10.1016/j.bios.2018.02.025

• Journal Article Type: Article
• Acceptance Date: Feb 8, 2018
• Online Publication Date: Feb 10, 2018
• Publication Date: 2018-06
• Deposit Date: Jul 19, 2022
• Journal: Biosensors and Bioelectronics
• Print ISSN: 0956-5663
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 107
• Pages: 192-202
• DOI: https://doi.org/10.1016/j.bios.2018.02.025
• Public URL: http://researchrepository.napier.ac.uk/Output/2890717