Wrinkle-Like Polyaniline Nanowires Thin-Film-Based Flexible Pressure Sensors for Dynamic and Static Activity Tracking

In wearable electronic devices, designing flexible pressure sensors with high sensitivity, excellent mechanical stability, outstanding bending performance, and good electrical and response stability remains a significant challenge. Selecting an appropriate structure and materials with high electrical conductivity is crucial to address this challenge. This study synthesizes polyaniline (PANI) nanowires using interfacial polymerization and fabricates a novel wrinkled microstructure through repetitive stretching. A flexible pressure sensor based on wrinkled PANI nanowire films was successfully constructed. This sensor exhibits not only excellent electrical and response stability but also high sensitivity, with sensitivity values of 22.23 kPa−1 (5 Pa to 3 kPa), 7.89 kPa−1 (3–18 kPa), and 3.32 kPa−1 (18–36 kPa). The response times are 97 and 128 ms, respectively, with outstanding mechanical stability and bending performance. Thus, the pressure sensor developed in this work has potential application value in high-sensitivity tactile perception, human–computer interfaces, and weak signal detection.