Autonomous Self-Healing, Self-Adhesive, Highly Conductive Electrodes Based on Silver-Polyborosiloxanes/Polydimethylsiloxane Double-Network Composites
Self-healing conductive composites have attracted tremendous interests in recent years owing to their many important applications especially in stretchable and reconfigurable electronics as self-healing electrodes. However, the conductivity of these conductive composite electrodes after healing is limited by the poor capability of the self-healing polymer matrix to transport the conductive fillers. Herein, we report a novel stretchable self-healing electrode based on polyborosiloxane (PBS)/polydimethylsiloxane (PDMS) double-network (DN) matrix. The chemically cross-linked PDMS network renders the electrode good elasticity and mechanical robustness while the non-covalent supramolecular interactions in PBS network provide it self-healing and self-adhesive capability. Moreover, this DN matrix is able to transport not only silver nanowires on the composite surfaces, but also heavier conductive fillers such as silver microflakes embedded inside the bulk, yielding a bulk resistivity as low as 0.002 Ω.cm and achieving 100% restoration of its original conductivity after damage without any external stimulus. This unique combination of high conductivity, automonous self-healing of both electrical conductivity and mechanical strength, and self-adhesion may endow the novel electrode with a wide range of applications.