The Addition of an Ultra‐Small Amount of Black Phosphorous Quantum Dots Endow Self‐Healing Polyurethane with a Biomimetic Intelligent Response

Abstract

AbstractThis study explores new applications of black phosphorus quantum dots (BPQDs) by adding them to self‐healing material systems for the first time. Self‐healing polyurethane with an ultra‐small amount of BPQDs has biomimetic intelligent responsiveness and achieves balance between its mechanical and self‐healing properties. By adding 0.0001 wt% BPQDs to self‐healing polyurethane, the fracture strength of the material increases from 3.0 to 12.3 MPa, and the elongation at break also increases from 750% to 860%. Meanwhile, the self‐healing efficiency remains at 98%. The addition of BPQDs significantly improves the deformation recovery ability of the composite materials and transforms the surface of self‐healing polyurethane from hydrophilic to hydrophobic, making it suitable for applications in fields such as electronic skin and flexible wearable devices. This study provides a simple and feasible strategy for endowing self‐healing materials with biomimetic intelligent responsiveness using a small amount of BPQDs.