Self-Healable Hydrogel–Liquid Metal Composite Platform by 3D-Printed Stamp Patterning for a Multimodular Sensor System
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Hydrogel and liquid metal materials have shown potential in developing self-healing electronics. Our research presents a facile fabrication strategy for a customized hydrogel–liquid metal composite and its various applications. The electrical pathway of the hydrogel is formed using a 3D-printed mold and is then filled with liquid metal. Using a moisture-protectant coating on the hydrogel and an oxidized layer of liquid metal significantly improves its lifetime and self-healing abilities. This hydrogel-liquid metal composite was successfully used as self-healable electrodes in a customizable multimodular sensor system that included a photoresistor, thermistor, and tilt switch. It was also found to be an effective electrode for biosignal detection, with comparable performance to that of a standard Ag/AgCl electrode. This research shows the potential for further self-healing electronics advancements using hydrogel-liquid metal composites.