This Letter reports a wearable mechano-acoustic sensor for continuous cardiorespiratory monitoring. The sensing mechanism is based on reversible iodide/triiodide () electrochemical redox reaction on microfabricated platinum electrodes, enabling an ultra-high sensitivity on the detection of mechano-acoustic signals of the cardiorespiratory system. Ecoflex, a flexible silicone rubber, is adopted as the material of the sensor body due to its excellent stretchability, robustness, and skin-compatibility. The developed sensor exhibited a noise floor of 4.5 μg/z at 10 Hz. Detection of heart sounds, lung sounds, and respiration rates was demonstrated.
A wearable mechano-acoustic sensor based on electrochemical redox reaction for continuous cardiorespiratory monitoring
Zhiguo Zhao, Xiaoce Feng, Xiaoyu Chen, Lenore L. Dai, Yong Xu; A wearable mechano-acoustic sensor based on electrochemical redox reaction for continuous cardiorespiratory monitoring. Appl. Phys. Lett. 11 January 2021; 118 (2): 023703. https://doi.org/10.1063/5.0029108
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