Self-Adhesive Dry Ionic Conductors Based on Supramolecular DeepEutectic Polymers

Ionic conductors have promising applications in thefield offlexible electronics, but they usually suffer from weakbonding to substrates (<0.3 MPa), leading to large interfacialimpedances or detachment under repeated deformation. Here, asupramolecular deep eutectic polymer synthesized by in situphotopolymerization of a polymerizable deep eutectic solventmonomer is proposed as a self-adhesive dry ionic conductor(SADIC). The SADICs obtained are rich in dynamic hydrogenbonding and ions, which can instantly form various interfacialinteractions andfirmly adhere to substrates and maintain goodmechanical robustness. Notably, the maximum adhesion strength isup to similar to 3.5 MPa (on indium tin oxide (ITO) glass). Furthermore,the SADICs also show other comprehensive properties such ashigh transparency, tunable stretchability, favorable conductivity, and excellent mechanical and electrical self-healing capabilities. As ademonstration, the SADIC can be used as a durably self-adhesive ionic skin for volume change and deformation monitoring. Thesefindings provide a promising strategy for improving device integration and enhancing the performance offlexible electronics.