Printed flexible sweat sensors

On-skin flexible sensors are promising for non-invasive health monitoring. Joseph Wang and colleagues report a stretchable on-skin sweat-sensing platform that integrates a stretchable battery and a digital electrochromic display and can thus work without interfacing with any external devices. The devices can be based on enzymatic or potentiometric electrochemical sensors and comprise a high-performance stretchable Ag2O–Zn battery, ten electrochromic pixels and a small microcontroller. The integrated electrochromic display enables real-time, direct visualization of the analytical data. All the components apart from the microcontroller are fabricated by high-throughput screen printing of elastomeric or silver inks. The devices can sense various metabolites and electrolytes present in sweat, including sodium ions, pH, glucose and lactate. These sensors could be used in different application scenarios, from health-care monitoring to professional sports.

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