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

Research output: Contribution to journalArticlepeer-review

Abstract

This Letter reports a wearable mechano-acoustic sensor for continuous cardiorespiratory monitoring. The sensing mechanism is based on reversible iodide/triiodide (I - / I 3 -) 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/ Hz at 10 Hz. Detection of heart sounds, lung sounds, and respiration rates was demonstrated.

Original languageEnglish (US)
Article number023703
JournalApplied Physics Letters
Volume118
Issue number2
DOIs
StatePublished - Jan 11 2021

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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