Dual-Sided Microstructured rGO–CNT Flexible Sensors for High-Sensitivity and Wide-Range Pressure Detection

Abstract

Recent advancements in flexible electronics have highlighted the importance of microstructured sensor designs for enhancing device performance. However, developing thin-film sensors that maintain both high sensitivity and wide measurement range remains a significant challenge. We present a pressure sensor that combines reduced graphene oxide (rGO), carbon nanotubes (CNT), and polydimethylsiloxane (PDMS) in a microstructured architecture. The sensor incorporates a pressure-sensitive film featuring double-sided embossed microstructured surfaces. This unique design enables a remarkable measurement range of 0–180 kPa while preserving exceptional sensitivity of 0.2 kPa^–1 in the 0–13 kPa range. The exceptional performance attributes of this sensor make it highly suitable for applications demanding both precision at low pressures and broad operational capabilities. We have demonstrated the versatility of this sensor by successfully employing it for handwriting recognition and plantar pressure monitoring applications. This work represents a significant advancement in the field of flexible film sensors, paving the way for their widespread adoption in real-world applications, from wearable electronics to human–machine interfaces.