Bio‐Inspired Skin From Cellulose‐Augmented, Solvent‐Free Biomass Ionogel Integrating Self‐Healing, Adhesion, and Multimodal Sensing

ABSTRACT Ionic sensors, serving as key interfaces between biological organisms and electronic systems, show significant potential in wearable electronics due to their flexibility and low impedance. However, solvent evaporation degrades traditional ionic conductors, limiting their stability and lifespan. Inspired by human skin, this work constructs a multifunctional ionogel (LIPC) via a one‐pot method using biomass‐derived lipoic acid, 1‐ethyl‐3‐methylimidazolium ethyl sulfate, and a polyurethane‐cellulose framework. Leveraging dynamic disulfide and multiple hydrogen bonds, LIPC exhibits robust mechanical properties (fracture strength: 76 kPa, strain: 600%), stable skin adhesion (280 N/m), and high self‐healing efficiency (98.5%). The continuous conductive network from the ionic liquid endows high sensitivity (gauge factor, GF = 7.6), fast response (210 ms), and a broad strain range (5%–300%), while its solvent‐free system ensures fatigue resistance with only 16% decay after 1000 cycles. Dynamic bonding enables rapid reconstruction of conductive pathways after damage, achieving 60% electrical repair efficiency. Benefiting from strong adhesion and sensitive signal transduction, LIPC accurately captures human motion signals and enables real‐time robotic hand control via finger gestures. Its intrinsic temperature perception and piezoresistive properties extend applications to environmental monitoring and encrypted communication, offering an innovative solution for smart healthcare, human‐machine interaction, and secure information transmission.