Super-stretchable and adhesive cellulose Nanofiber-reinforced conductive nanocomposite hydrogel for wearable Motion-monitoring sensor

Conductive hydrogel has been considered as a promising material for wearable sensors, constructing a flexible conductive hydrogel sensor with super stretchability, adhesion, and sensing stability is essential, but still challenging. Herein, A super-stretchable, adhesive, and conductive nanocomposite hydrogel was successfully constructed by a facile and one-pot process in conjunction with ball milling and blending. The resulting hydrogel exhibited super-stretchable ability (2795%), excellent tensile stress (128.6 kPa), good fatigue resistance, and self-recovery ability due to multiple cross-linked network structures, including physical hybrid networks (hydrogen bonds and ionic coordination bonds) and flexible polyacrylamide networks. Moreover, the nanocomposite hydrogel showed outstanding conductivity stability, fast response, durability, and repeatability. And it displayed excellent adhesion on various materials. Strain sensors based on hydrogels showed high sensitivity, stability, and action recognition ability. In summary, this work provides a simple strategy for preparing conductive hydrogel sensors with high stretchability, adhesion, and stability, and has potential application prospects in the field of wearable sensors for human body motion detection.