Ultrahigh Sensitive Wearable Pressure Sensors Based on Reduced Graphene Oxide/Polypyrrole Foam for Sign Language Translation

Abstract Pressure sensors have attracted worldwide attention due to their extensive application requirements in wearable devices, flexible touch display, soft robotics, and health monitoring. Although many pressure sensors have been developed, it still remains a grand challenge to achieve ultrahigh sensitivity with good stability in low‐pressure regions. Herein, the polypyrrole (PPy) is introduced to reduced graphene oxide foam (rGOF) via in situ solventless polymerization to manufacture rGO/PPyF, which significantly enhances the sensitivity and stability of the derived sensors. The as‐fabricated sensor demonstrates an ultrahigh sensitivity of 32.32 kPa⁻¹ in the pressure region of 0–21 Pa, high resolution, and excellent cycling stability. Furthermore, the pressure sensor can transform different hand gestures to distinguishable electrical signals in sign language translation, which indicates that the pressure sensor has a bright application prospect in wearable devices and human–computer interaction.