All‐in‐One Soft Capacitive Pressure Sensor with Adaptive Self‐Healing Property in Diverse Harsh Environments

Abstract High‐performance soft capacitive pressure sensors have attracted attention due to their wide application in health monitoring, human–machine interaction and intelligent robotics. However, their deployment in diverse environments often subjects them to mechanical damage, rendering them unable to provide reliable signals during long‐term use. Herein, an all‐in‐one capacitive pressure sensor is designed with a full‐module self‐healing function based on chemically modified polydimethylsiloxane (PDMS). Dynamic imine and disulfide bonds incorporated into the polymer network enable efficient autonomous healing of the polymer under ambient conditions, aqueous settings, at subzero temperatures (−15 °C), and in high‐concentration saline environments (35 wt% NaCl). The electrode and dielectric layer are fabricated by using multi‐walled carbon nanotubes (CNT) and PEDOT:PSS as the fillers. Traditional self‐healable capacitive pressure sensors usually focus on endowing the healability of individual components, while the mechanical mismatch between different components hinders the entire device from self‐healing. The all‐in‐one sensor design can avoid the mechanical mismatch and delamination between components, thus rendering a self‐healing property at the device level. When integrated into a soft robotic gripper and submarine model, the sensor consistently restored sensing properties after damage. These results confirm its significant promise for application as a robust, self‐healing sensor across a wide range of environments.