Structural Design and Performance of CNT/rGO-Modified Three-Dimensional Fibrous Network-Based Pressure Sensors

To address issues such as low sensitivity and complex fabrication processes of traditional resistive flexible pressure sensors, a 3D fiber network composite modified with carbon nanotubes (CNT) and reduced graphene oxide (rGO) was prepared. Based on this composite, two flexible pressure sensors with different structures were constructed: a traditional resistive structure (TCG) and an interdigital electrode structure (ICG). Experimental results show that the TCG sensor exhibits a sensitivity of 0.015 kPa⁻¹ in the range of 0-29.5 kPa and 1.24×10⁻³ kPa⁻¹ in the range of 29.5-103.78 kPa, demonstrating a wide response range (0-103.78 kPa). In contrast, the ICG sensor achieves a high sensitivity of 1.876 kPa⁻¹ in the range of 0-0.47 kPa and 0.88×10⁻³ kPa⁻¹ in the range of 0.47-110.81 kPa. It not only has a wider detection range (0-110.81 kPa) but also faster response and recovery times (24.4/97.7 ms). Additionally, the sensor maintains good performance stability after more than 6000 pressure cycles. The ICG sensor can accurately recognize wrist, elbow, and knee movements, as well as subtle physiological signals such as swallowing and blinking. It shows broad application prospects in the fields of motion monitoring and healthcare.