Photoluminescent dual cross-linked ionogels with high-stretchability, multi-responsive, and self-adhesive properties for information encryption transmission and wearable sensors

Stretchable photoluminescent multi-responsive dual cross-linked ionogel has been fabricated. • The ionogels show special thermochromic and multiple photoluminescent properties for information encryption transmission. • The ionogels exhibit high stretchability, elasticity, thermomechanical stability, and self- adhesive ability. • The visual wearable sensors excellent strain/temperature sensitivity, fast response, and stable signals output. Flexible ionogels with optical functions have recently emerged as promising applications in visual wearable sensors and information encryption transmission. Nevertheless, it still remains a great challenge to realize multiple functions within a single system. Herein, a stretchable photoluminescent multi-responsive chemical-physical dual cross-linked ionogel with microphase separated structures has been fabricated via a two-step method: initially through copolymerization, followed by an amine-epoxy ring-opening reaction. The chemical-physical dual cross-linked networks, more polar groups, and strong interactions can endow the as-prepared ionogels with high stretchability, good elasticity, excellent ionic conductivity, extraordinary thermomechanical stability, and adhesion to various substrate surfaces. Furthermore, the ionogels have unique thermo-responsive properties and special multiple photoluminescent performances, which can be used for information encryption transmission. Importantly, the ionogel-based visual thermal/mechanical-responsive wearable sensors display excellent strain/temperature sensitivity, fast response, stable and reproducible electrical signals output, which can sensitively detect various human motions as well as for human-machine interaction. This work provides an effective design strategy for preparing multifunctional flexible ionogel sensors. Download: Download high-res image (169KB) Download: Download full-size image