Issue 16, 2020

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 of sweat pH values in the out-of-hospital environments. Herein, we report a stretchable gold fiber-based electrochemical pH sensor based on our recently developed elastomer-bonded gold nanowire coating technology. The densely packed gold film offers 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 the 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 per pH), high selectivity against cationic interference and high stretchability (up to 100% strain). One of the attributes for the fiber-based sensors is that they can be weaved into textiles, holding great potential for integration into everyday clothing for “unfeelable” personal health monitoring.

Graphical abstract: Stretchable gold fiber-based wearable electrochemical sensor toward pH monitoring

Supplementary files

Article information

Article type
Paper
Submitted
04 11 2019
Accepted
07 1 2020
First published
07 1 2020

J. Mater. Chem. B, 2020,8, 3655-3660

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, 8, 3655 DOI: 10.1039/C9TB02477H

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