Breathable, Nanonet‐Reinforced Ultrathin Ionogel Film via Hydrogen Bonding‐Ion Dipole Synergy for Multifunctional Wearable Sensors

Abstract Ionogels have emerged as highly promising materials for flexible electronic skin (e‐skin) due to their exceptional electrical conductivity, high stability, and biocompatibility. Nevertheless, reconciling breathability with skin conformability while maintaining mechanical integrity remains a critical challenge in the development of ionogels. Herein, a hydrogen bonding and ion‐dipole synergy strategy is proposed to prepare a nanonet‐reinforced ultrathin ionogel film (UIF) with a thickness of only 12 µm, yet exhibiting outstanding multifunctional performance, including a remarkable sensitivity (gauge factor of 2.37), outstanding environmental resilience (−40 to 60 °C), an extensive strain response range (0–483%), and exceptional fatigue resistance. Furthermore, its superior gas permeability (2464.4 g·m ⁻¹ ·day ⁻¹ ) significantly enhances epidermal breathability, addressing a key limitation of conventional wearable materials. Moreover, when integrated into flexible wearable devices, the UIF ensures optimal skin adherence and user comfort, setting a new benchmark for wearable technology. By leveraging a supervised machine learning algorithm, such as an artificial neural network (ANN), the system achieves an impressive 96.6% accuracy in real‐time analysis of human knee motion signals, enabling continuous, high‐precision motion tracking. This advanced ionogel not only paves the way for next‐generation flexible e‐skins with high conformability but also holds great potential in smart medicine and human‐machine interaction.