A Simple and Efficient Preparation Method for Flexible Pressure Sensors Using Salt Template and Vacuum Infiltration

Abstract Flexible pressure sensor has a wide range of applications in physiological signal monitoring. Besides, flexible pressure sensors with good properties like high sensitivity, flexibility, and excellent stability have become a key direction for the research. In this paper, micro‐structured sponges (polydimethylsiloxane/carbon nanotube (PDMS/CNT)) is prepared using a salt template, followed by the application of vacuum infiltration to introduce graphene nanoparticles (GNPs) into the sponge skeleton. Surface microstructures are further created using sandpaper to enhance sensitivity. The prepared flexible sensor not only achieves a high gauge factor (GF = 17.14) and extremely low detection limits (4.5 mN) but also exhibits exceptional stability (over 3500 pressure cycles at 5% strain, the periodic signals do not decay or show significant differences). In addition, the sensor exhibits a feature of fast response (80 ms). The proposed method features low cost and simple production processes, showcasing significant promise and extensive application potential in intelligent healthcare across diverse areas.