Stable, Highly Conductive, and Strain‐Insensitive Supramolecular Elastomer Composite for Printable Self‐Healing Soft Electronics

Abstract

Abstract Stretchable and self‐healing soft conductive materials are essential for soft electronics, robotics, wearables, and bioelectronics. However, achieving a single material that simultaneously offers high and stable conductivity, minimal resistance changes under extreme stretching, high‐resolution universal printability, autonomous self‐healing, and pressure‐sensitive adhesive properties for direct bonding of surface‐mountable components remains challenging. Here, a printable ink composed of liquid metal microparticles and carboxylic acid‐functionalized carbon nanotubes, blended into a bimodal supramolecular elastomer matrix is introduced. After photothermal activation, the material is capable of reorganizing conductive pathways and achieves a high conductivity (> 20000 S·cm −1 under strain), exceptional strain insensitivity ( R/R 0 < 3.95 up to 500%), and an elastic working range >700%. The reversible oxygen‐boron and hydrogen bonding enable both effective autonomous self‐healing and direct assembly of self‐healing hybrid electronic circuits and systems through self‐adhesiveness. To showcase the high performance and functionality, a highly stretchable, self‐healing, and waterproof 3 × 5 pixel display is fabricated.