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Integrated solid-state wearable sweat sensor system for sodium and potassium ion concentration detection

Haowei Zhang (School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China)
Lili Sun (School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China)
Chengli Song (School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China)
Ying Liu (School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China)
Xueting Xuan (School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, China)
Fei Wang (Department of Mechanical Engineering, University of Houston, Houston, Texas, USA)
Jing Zhong (School of Civil Engineering, Harbin Institute of Technology, Harbin, China)
Li Sun (Department of Mechanical Engineering, University of Houston, Houston, Texas, USA)

Sensor Review

ISSN: 0260-2288

Article publication date: 7 December 2022

Issue publication date: 13 January 2022

802

Abstract

Purpose

Design, fabricate and evaluate all-solid-state wearable sensor systems that can monitor ion concentrations in human sweat to provide real time health analysis and disease diagnosis capabilities.

Design/methodology/approach

A human health monitoring system includes disposable customized flexible electrode array and a compact signal transmission-processing electronic unit.

Findings

Patterned rGO (reduced-graphene oxide) layers can replace traditional metal electrodes for the fabrication of free-standing all solid film sensors to provide improved flexibility, sensitivity, selectivity, and stability in ion concentration monitoring. Electrochemical measurements show the open circuit potential of current selective electrodes exhibit near Nernst responses versus Na+ and K+ ion concentration in sweat. These signals show great stability during a typical measurement period of 3 weeks. Sensor performances evaluated through real time measurements on human subjects show strong correlations between subject activity and sweating levels, confirming high degree of robustness, sensitivity, reliability and practicality of current sensor systems.

Originality/value

In improving flexibility, stability and interfacial coherency of chemical sensor arrays, rGO films have been the developed as a high-performance alternative to conventional electrode with significant cost and processing complexity reduction. rGO supported solid state electrode arrays have been found to have linear potential response versus ion concentration, suitable for electrochemical sensing applications. Current sweat sensor system has a high degree of integration, including electrode arrays, signal processing circuits, and data visualization interfaces.

Keywords

Acknowledgements

HWZ, LLS, CLS, YL and XTX thank the financial support from Shanghai Engineering Research Center of Interventional Medical Device (Grant No.18DZ2250900) and National Natural Science Foundation of China (Grant No.51735003 and 82073474); JZ thanks National Natural Science Foundation of China (Grant No.52073073); FW and LS would also like to thank UH for internal funding support.

Citation

Zhang, H., Sun, L., Song, C., Liu, Y., Xuan, X., Wang, F., Zhong, J. and Sun, L. (2022), "Integrated solid-state wearable sweat sensor system for sodium and potassium ion concentration detection", Sensor Review, Vol. 42 No. 1, pp. 76-88. https://doi.org/10.1108/SR-03-2021-0081

Publisher

:

Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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