3D-printed stretchable sensor based on double network PHI/PEDOT:PSS hydrogel annealed with cosolvent of H2O and DMSO

3D-printed stretchable sensors have promising applications in wearable devices, human-computer interaction, soft robotics, and many other fields. However, low conductivity and poor stretchability still hinder their extensive applications. Herein, we report a strategy of double networks and annealed PEDOT:PSS for the first time. The new material combines mechanical stretch performance and conductivity together, where 3D-printed complex stretchable poly(2-hydroxyethyl acrylate-isobornyl acrylate) (PHI) structure serves as the tough network and annealed highly conductive PEDOT:PSS serves as the functional network. It is adopted to build 3D-printed porous stereo structures with both stretchability and conductivity. It exhibits interconnected uniform networks, improved storage modulus (1.3 * 106 Pa), higher conductivity (The conductivity of PHI/PEDOT: PSS annealed is up to 3.12 * 10-1 S m-1, which is 441 times compared to PHI/PEDOT: PSS), excellent stability and durability at a large strain of 60%. Hence, it is expected that this new strategy will open up wide possibilities for designing stretchable sensors and smart devices.