Self-healing flexible sensor based on metal-ligand coordination

Abstract

Self-healing is an indispensable property of the next generation wearable electronic devices. However, it is a hugely difficult problem to achieve good self-healing abilities and good elastic properties at different conditions. Herein, we report a self-healing substrate from commercially available methyl vinyl silicone rubber (MVQ) that has been cross-linked through metal-ligand coordinate bonds. The strain sensor was then assembled by coating nanostructured conductive layer (Multiwall carbon nanotubes (CNTs) film and silver film) onto the self-healing elastomeric substrate. The resulting flexible sensors show a desirable healing efficiency under both high temperatures and underwater conditions. Notably, the healed strain sensors can still precisely capture diverse human activities, such as large limb movements and minute physiological activities. The self-healing strain sensors demonstrated in this study will push forward the design and application of stretchable and flexible electronic devices.