An epifluidic electronic patch with spiking sweat clearance for event-driven perspiration monitoring

Sangha Kim, Seongjin Park, Jina Choi, Wonseop Hwang, Sunho Kim, In-Suk Choi, Hyunjung Yi () and Rhokyun Kwak ()
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Sangha Kim: Hanyang University
Seongjin Park: Korea Institute of Science and Technology
Jina Choi: Hanyang University
Wonseop Hwang: Korea Institute of Science and Technology
Sunho Kim: Korea Institute of Science and Technology
In-Suk Choi: Seoul National University
Hyunjung Yi: Korea Institute of Science and Technology
Rhokyun Kwak: Hanyang University

Nature Communications, 2022, vol. 13, issue 1, 1-12

Abstract: Abstract Sensory neurons generate spike patterns upon receiving external stimuli and encode key information to the spike patterns, enabling energy-efficient external information processing. Herein, we report an epifluidic electronic patch with spiking sweat clearance using a sensor containing a vertical sweat-collecting channel for event-driven, energy-efficient, long-term wireless monitoring of epidermal perspiration dynamics. Our sweat sensor contains nanomesh electrodes on its inner wall of the channel and unique sweat-clearing structures. During perspiration, repeated filling and abrupt emptying of the vertical sweat-collecting channel generate electrical spike patterns with the sweat rate and ionic conductivity proportional to the spike frequency and amplitude over a wide dynamic range and long time (> 8 h). With such ‘spiking’ sweat clearance and corresponding electronic spike patterns, the epifluidic wireless patch successfully decodes epidermal perspiration dynamics in an event-driven manner at different skin locations during exercise, consuming less than 0.6% of the energy required for continuous data transmission. Our patch could integrate various on-skin sensors and emerging edge computing technologies for energy-efficient, intelligent digital healthcare.

Date: 2022
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DOI: 10.1038/s41467-022-34442-y

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