Printed Self‐Healing Stretchable Electronics for Bio‐signal Monitoring and Intelligent Packaging

Integrating self‐healing capabilities into printed stretchable electronic devices is important for improving performance and extending device life. However, achieving printed self‐healing stretchable electronic devices with excellent device‐level healing ability and stretchability while maintaining outstanding electrical performance remains challenging. Herein, a series of printed device‐level self‐healing stretchable electronic devices is achieved by depositing liquid metal/silver fractal dendrites/polystyrene‐block‐polyisoprene‐block‐polystyrene (LM/Ag FDs/SIS) conductive inks onto a self‐healing thermoplastic polyurethane (TPU) film via screen printing method. Owing to the fluidic properties of the LM and the interfacial hydrogen bonding and disulfide bonds of TPU, the as‐obtained stretchable electronic devices maintain good electronic properties under strain and exhibit device‐level self‐healing properties without external stimulation. Printed self‐healing stretchable electrodes possess high electrical conductivity (1.6 × 105 S m−1), excellent electromechanical properties, and dynamic stability, with only a 2.5‐fold increase in resistance at 200% strain, even after a complete cut and re‐healing treatment. The printed self‐healing capacitive stretchable strain sensor shows good linearity (R2 ≈0.9994) in a wide sensing range (0%–200%) and is successfully applied to bio‐signal detection. Furthermore, the printed self‐healing electronic smart label is designed and can be used for real‐time environmental monitoring, which exhibits promising potential for practical application in food preservation packaging. Printed device‐level self‐healing stretchable electronics are fabricated using a low‐cost and high‐efficiency screen‐printing method, which shows excellent device‐level healing capabilities and good stretchability while maintaining outstanding electrical performance, and are used in bio‐signal monitoring and intelligent packaging.