A Microfiber-Reinforced Janus Hydrogel E-Skin With Recyclable Feature for Multimodal Sensing and Gender-Specific Physiological Monitoring

Hydrogel-based wearable electronics hold great promise for physiological monitoring, yet their application in privacy-sensitive regions remains constrained by the simultaneous demands of ultrathin form factors, mechanical robustness, multimodal sensing, and long-term stability. Inspired by dragonfly wings, this study develops a gelatin hydrogel e-skin reinforced with polyurethane (PU) microfibers, featuring ultra-thinness (7.15 µm), high strength (55.62 MJ m⁻³), and high sensitivity (GF = 2.52, TCR = 3.5%°C⁻¹). Its controlled binary heterogeneous structure ensures asymmetric adhesion and long-term skin conformability. A deep eutectic solvents (DES)-induced ion-electron dual-conducting system enhances conductivity by 13 times while improving flexibility, thereby boosting sensing performance. This sensor boasts biocompatibility, antibacterial properties, transparency, freeze resistance and recyclability. It enables high-precision continuous monitoring and achieves multimodal signal decoupling via finite element design. Integrated with flexible circuits and wireless modules, it supports non-invasive at-home tracking of privacy signals during pregnancy and erectile function. This work offers an intelligent solution for high-precision monitoring in precision and personalized healthcare.