Bio‐Inspired Janus All‐Nanofiber Self‐Powered Electronic Skins for Multifunctional, High‐Resolution, Artifact‐Free Human–Machine Interface

ABSTRACT Artificial skins combining sustainable tactile sensing and high‐precision contextual interaction could transform medical devices and robotics yet developing body‐integrated systems that are electrically stable, comfortable, and scalable remain challenging. We develop a heterogeneous Janus e‐skin enabled by gel‐fiber‐mediated interlayer adhesion and co‐design of materials, structure, and architecture. An engineered polyurethane ionogel (PUIL) coupled with an elastic SBS scaffold redistributes mechanical stress. Hydrogen bonding and ion‐dipole interactions immobilize the liquid metal (LM) conductor to form a reconfigurable interface. Consequently, interleaved conductive, strain‐insensitive nanofiber electrodes mitigate LM migration and leakage and exhibit exceptional long‐term electrical stability, withstanding 400% strain with minimal resistance change (R/R 0 ≈ 1.07). The bonding interlayer and hierarchically porous Janus membrane create a surface‐energy gradient that promotes air permeability and unidirectional moisture transport, thereby improving comfort and cycling durability. Additionally, the Janus fibrous membrane mitigates strain/thermal/moisture‐induced signal distortion, ensuring stable bioelectrical feedback and bolstering the robustness of machine‐learning‐assisted decoding in self‐powered human–machine interactions. Remarkably, the e‐skin exhibits excellent scalable bioinspired multifunctional protection, enabling seamless module integration for electromagnetic shielding and on‐demand thermal management. This work paves the way for next‐generation human–machine interfaces by demonstrating a holistic strategy that achieves wearer comfort, multifunctional integration, and multi‐scenario AI interaction.