Three-Dimensional Porous Electronic Skin Based on Carbon Nanotubes

Abstract

Electronic skin is an emerging technology widely used in tactile sensors, wearable devices, robots, and human-computer interaction interfaces. Among them, flexible pressure sensors have attracted much attention due to their flexibility, high sensitivity, and fast response. This article introduces a method for manufacturing pressure sensors by coating conductive filler carbon nanotubes on three-dimensional porous sponges. This pressure sensor performs well even under low pressure, with high sensitivity (0.075783~5.34173 kPa-1) and wide operating range (0~25 kPa), fast response time (70 milliseconds), and fast recovery time (90 milliseconds). In addition, the sensor exhibits high repeatability and consistent response signals during loading/unloading cycles (1 Hz, 0-25 kPa, 2200 seconds). This flexible sensor can monitor human activities such as finger bending and knee movements. The research results indicate that flexible pressure sensors based on three-dimensional porous sponges have broad application prospects in human motion detection, intelligent medical monitoring, and wearable devices.

Keywords: pressure sensor, sensitivity, fast response, three-dimensional porous sponge