Journal
TALANTA
Volume 222, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2020.121484
Keywords
Lactate biosensor; Smart textile; Gold fiber; Wearable electrochemical sensor; Stretchable electrodes
Categories
Funding
- Australian Research Council [DP180101715, DP170102208]
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In recent years, there has been a growing interest in developing wearable biosensors for non-invasive monitoring of vital signs and chemical/biological markers, with textiles being considered a promising platform due to their breathability, softness, and comfort. Gold is favored as an active sensing material for fabricating lactate biosensors due to its biocompatibility and wide electrochemical window. Dry-spinning method was used to produce stretchable, strain-insensitive and highly conductive gold fibers which could be integrated into textiles for monitoring lactate levels with high sensitivity.
Past several years have witnessed growing interest in developing wearable biosensors for non-invasive monitoring vital signs of chemical/biological markers such as lactate. In this context, textiles can be seen as a promising platform for the integration of wearable chemical sensors due to their inherent breathability, flexibility, softness and comfortableness. Gold is regarded as a preferred active sensing material due to its excellent biocompatibility, chemical inertness and wide electrochemical window. Here, a dry-spinning method was used to fabricate stretchable, strain-insensitive and highly conductive gold fibers. Such gold fibers could be used to fabricate lactate-sensing working electrodes, reference electrode, counter electrodes and further weaved into textiles in a standard three-electrode system with a planar layout. The textile lactate biosensors showed a high sensitivity of 19.13 mu A/mM cm(2) in phosphate-buffered solution (PBS) and 14.6 mu A/mM cm(2) in artificial sweat. This sensitivity could be maintained under high tensile strain up to 100% without external structural design. The results presented here indicate the potential application of wearable smart textile towards non-invasive lactate monitoring.
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