3D printing of robust, self-healing, and highly sensitive pressure sensor based on an interpenetrating polymer network elastomer

Flexible pressure sensors still face the challenge of combining good mechanical stability, high sensitivity, and wide detection range. Herein, an interpenetrating polymer network polyurethane acrylate (IPNPUA) resin was designed to realize the rapid construction of pressure sensors with self-healing capability and reliable durability. Based on the interpenetrating polymer network, the IPNPUA elastomers exhibited high strength (17.8 MPa), healing ability at 60 degrees C, and degradability. Subsequently, the dielectric layer with imitated checkboard interlocking microstructure was designed and prepared by digital light processing (DLP) 3D printing. The fabricated flexible pressure sensor demonstrated high sensitivity (0.125 kPa(-1)), wide detection range (700 kPa), and stable monitoring of human motion. The pressure sensor prepared in this work showing promising prospects in the field of wearable electronics.