High‐Sensitivity Flexible Porous Polydimethylsiloxane/Carbon Nanotubes Pressure Sensor for Human Motion and Tactile Interaction

Flexible piezoresistive pressure sensors have broad application prospects in wearable electronics, intelligent interactions, and health monitoring because of their excellent wearability and mechanical flexibility. However, achieving high sensitivity, a wide detection range, and long‐term stability at low cost remains a key challenge. In this article, a flexible piezoresistive pressure sensor was fabricated using low‐cost multiwalled carbon nanotubes (CNTs) and porous polydimethylsiloxane (PDMS), with conductive cloth as electrodes. By adjusting the CNTs mass fraction and film thickness, the effects of the CNTs on the electrical and mechanical properties of the sensor were systematically studied. The sensor achieved a high sensitivity of 3.68 kPa −1 (<13 kPa), a broad detection range (up to 210 kPa), a low detection limit (50 Pa), good durability over 1400 cycles, and rapid response/recovery times (120/154 ms). In addition, the sensor successfully detected human activities such as knee bending and finger motion, and accurately recognized Morse code gestures corresponding to numbers 0–9 and letters A–Z through pressure input. Notably, the entire fabrication process is simple, low‐cost, and environmentally friendly, providing a solid foundation for large‐scale production and practical applications in flexible wearable devices.