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Stretchable Gold Fiber-Based Wearable Electrochemical Sensor toward pH Monitoring

Abstract

Sweat pH is a key health indicator related to metabolism and homeostasis level through hydrogen ion concentration in biological bio-fluid. Therefore, increasing research efforts have been directed to develop wearable pH sensors towards continuous non-invasive monitoring sweat pH values in the out-of-hospital environments. Here, we report on a stretchable gold fiber-based electrochemical pH sensor based on our recently developed elastomer-bonded gold nanowire coating technology. The densely packed gold film offer superior strain-insensitive conductivity, high stretchability and large electrochemical active surface area (EASA). By electrodepositing polyamine (PANI) and Ag/AgCl onto the gold fibers, we could selectively detect pH based on open circuit potentials in an ion-selective electrode design. The obtained fiber-based pH sensors feature a great sensitivity (60.6 mV/pH), high selectivity against cationic interference and a high stretchability (up to 100% strain). One of the attributes for the fiber-based sensors is that they can be weaved into textile, holding great potential for integration into everyday clothing for “unfeelable” personal health monitoring.

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Supplementary files

Article information


Submitted
04 Nov 2019
Accepted
07 Jan 2020
First published
07 Jan 2020

J. Mater. Chem. B, 2020, Accepted Manuscript
Article type
Paper

Stretchable Gold Fiber-Based Wearable Electrochemical Sensor toward pH Monitoring

R. Wang, Q. Zhai, Y. Zhao, T. An, S. Gong, Z. Guo, Q. Shi, Z. Yong and W. Cheng, J. Mater. Chem. B, 2020, Accepted Manuscript , DOI: 10.1039/C9TB02477H

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