Self-Adhesive Dry Ionic Conductors Based on Supramolecular Deep Eutectic Polymers

Ionic conductors have promising applications in the field of flexible electronics, but they usually suffer from weak bonding to substrates (<0.3 MPa), leading to large interfacial impedances or detachment under repeated deformation. Here, a supramolecular deep eutectic polymer synthesized by in situ photopolymerization of a polymerizable deep eutectic solvent monomer is proposed as a self-adhesive dry ionic conductor (SADIC). The SADICs obtained are rich in dynamic hydrogen bonding and ions, which can instantly form various interfacial interactions and firmly adhere to substrates and maintain good mechanical robustness. Notably, the maximum adhesion strength is up to ∼3.5 MPa (on indium tin oxide (ITO) glass). Furthermore, the SADICs also show other comprehensive properties such as high transparency, tunable stretchability, favorable conductivity, and excellent mechanical and electrical self-healing capabilities. As a demonstration, the SADIC can be used as a durably self-adhesive ionic skin for volume change and deformation monitoring. These findings provide a promising strategy for improving device integration and enhancing the performance of flexible electronics.