Researchers at the University of California, Irvine have developed a wearable, wireless, and battery-free bioelectronic sensor that monitors health by detecting molecular biomarkers in human sweat. Named the In-Situ Regeneratable, Environmentally Stable, Multimodal, Wireless, Wearable Molecular Sweat Sensing System (IREM-W2MS3), the device is a flexible skin patch that can simultaneously measure cortisol, glucose, lactate, and urea in sweat, as well as the biomarkers associated with stress response, metabolic activity, physical exertion, and kidney function. What makes the solution unique is its ability to regenerate its sweat-sensing surfaces, trigger perspiration in users when required, and operate continuously for extended periods.
Wearable sensors offer a cost-effective, user-friendly way to track health, with sweat providing an ideal, noninvasive source of biological information. However, most sensors lose accuracy over time as molecules accumulate on their surfaces, and many rely on components that degrade under changing environmental conditions. High-precision, multi-biomarker sweat sensing has remained a challenge.
According to Rahim Esfandyar-pour, the study's senior author and an assistant professor of electrical engineering and computer science, IREM-W2MS3’s key innovation is its self-regenerating sweat sensors. The device uses a low voltage to automatically restore sensor performance, eliminating the need for manual cleaning or replacement. Tests showed it could nearly fully recover its sensitivity after repeated use.
“The regenerative capability of the IREM-W2MS3 addresses one of the biggest obstacles in long-term wearable biosensing, which is sensor surfaces that lose performance after repeated measurements because molecules remain bound to the sensing layer. By being able to refresh itself, generate sweat, and be worn for long durations outside of laboratory or clinical settings, the device offers users a health monitoring platform that is robust and highly practical,” said Esfandyar-pour.
The IREM-W2MS3 patch is battery-free, drawing power wirelessly from a smartphone or a custom reader via near-field communication. This wireless energy activates a hydrogel that enables sweat collection without physical exertion. Researchers believe the platform could be used for chronic disease management, mental health monitoring, sports performance, preventive care, early disease detection, and remote health tracking.
The research team submitted a patent application through UC Irvine’s Beall Applied Innovation, and the technology is currently under further development. The team is exploring pathways toward translation and manufacturing.
“Applications for the IREM-W2MS3 are numerous and varied,” said Esfandyar-pour. “Potential uses include chronic disease management, stress and mental health monitoring, sports science and performance optimization, preventive medicine and early disease detection, and remote community health monitoring. We designed this wearable to be durable, easy to use, and highly reliable.”
