An anti-adsorption electronic skin with “Solid-Like” slippery coating enables continuous, imperceptible and precise motion monitoring

Electronic skin (E-skin) that is simultaneously antifouling, biocompatible, and capable of continuous motion monitoring is essential for preventing injuries in individuals with motor dysfunction. Balancing these properties in complex biological environments, however, has proven difficult. Here, we report a highly stretchable, porous hydrogel-based e-skin (SSC e-skin) modified with nanohesive-based, densified skeletal “solid-like” slippery coating (SSC). The SSC is formed through the functionalized nanoparticles capturing silicone oil, along with the encapsulation of epoxy resin, and the dense microstructure formed by cross-linked nanoparticles, ensuring the retention and mechanical stability of the lubricant. The resulting SSC imparts mechanically stable, “slippery” properties to the SSC e-skin without impeding its breathability. This covalent modification strategy enables SSC e-skin to effectively resist biofouling under stretching, friction, and sweat erosion, while also demonstrating exceptional biocompatibility and being physically imperceptible. Crucially, the SSC does not compromise the hydrogel’s intrinsic mechanical properties or its sensitivity to strain. SSC e-skin maintains stable strain sensitivity even after 24-hour exposure to sweat, protein, and bacterial environments. Due to its anti-bioadsorption capability which can effectively avoid the influence of biological substances on its conductive path, SSC e-skin provides continuous and stable joint flexion monitoring signals throughout the day in complex biological environments. It achieves high precision motion perception, comparable to the 3D motion capture system. Furthermore, integrating with wireless circuits realizes a personalized human-computer interaction system, paving the way for next-generation systems in sports risk management and rehabilitation.