Flexible Piezoresistive Pressure Sensor Based on Graphene Nano Plateletes

Flexible pressure sensors have gained significant attention within the research community due to their exceptional capabilities across numerous applications. Among them, piezoresistive pressure sensors have demonstrated excellent performance, thanks to their simple working mechanism, low-cost sensor fabrication methods, and the extensive range of materials available. In this study, we demonstrate a flexible piezoresistive pressure sensor by following a low-cost fabrication approach that allows us to realize both the sensing layer and substrate. We utilized a sandpaper template-assisted method to achieve a micropatterned sensing substrate, while an efficient liquid-based transfer technique was used to fabricate the sensing layer. By repeating the transfer deposition method, we were able to achieve stable conductivity of the sensing layer, resulting in pressure sensitivity of 0.0002 kPa(-1) in the low-pressure range. The moderate sensitivity of the sensor was capable of detecting tactile pressure, as demonstrated by generating Morse code.