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.
Original language | English |
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Pages (from-to) | 3655-3660 |
Number of pages | 6 |
Journal | Journal of Materials Chemistry B |
Volume | 8 |
Issue number | 16 |
DOIs | |
Publication status | Published - 28 Apr 2020 |
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Melbourne Centre for Nanofabrication
Sean Langelier (Manager)
Office of the Vice-Provost (Research and Research Infrastructure)Facility/equipment: Facility