Breathable skin-interfaced bioelectronics with unprecedented properties for healthcare monitoring
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Skin-interfaced wearable electronics have raised substantial research interests owing to their versatility to continuously monitor the evolving dynamic human physiological states and to evaluate the overall health status. Conventional constituent materials are generally associated with biocompatibility issues due to their limited breathability and large mechanical mismatch with soft and curvilinear biological tissues; costly and complex fabrication procedures; nonbiodegradable polymer substrates; and strong electrical-mechanical coupling that results in degraded signal quality or device failure. Materials innovations that bypass these issues for skin-interfaced bioelectronics are the focus of the work. Given the cost-effectiveness and breathability, we start with the use of commercially available paper and pencil leads as supporting substrate and conductive electrodes. We then developed a multiscale porous elastomer substrate with substantially improved breathability and passive cooling property. We further synthesized porous liquid-metal-elastomer composites, where the porous structures can minimize leakage through damping effects and lower percolation thresholds to reduce liquid-metal usage. Finally, we report strain-invariant porous silver nanowire nanocomposites with extremely low percolation threshold for wireless power delivery and signal transmission.
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Ph. D.