Carbon Nanotube-Based Capacitive and Resistive Hybrid Pressure Textile Sensor for High Sensitivity

초록

As wearable sensors become more widely used, various studies are being conducted to improve the sensitivity and accuracy of sensors according to their application areas. However, current technology faces challenges in simultaneously enhancing comfort and high sensitivity. This study developed a hybrid pressure sensor that integrates capacitive-type and resistive-type sensors using 3D spacer polyester (PE)-based textiles coated with carbon nanotubes (CNTs). CNTs, as conductive particles, enhance sensitivity when integrated with the flexible textile. The hybrid sensors were fabricated with CNT concentrations of 0.02wt% and 0.04wt%, aiming to maintain high sensitivity across a wide pressure range. At the same strain, the 0.02wt% sample can measure up to 8.2 kPa, while the 0.04wt% sample can measure up to 10.5 kPa. The 0.02wt% hybrid sensor maintains an initial resistive sensitivity of 0.14 kPa-1$\text{kPa}{<}^{>}-1$, reaching a maximum sensitivity of 0.42 kPa-1$\text{kPa}{<}^{>}-1$ as pressure increases, and that of the 0.04wt% sensor increases from 0.21 kPa-1$\text{kPa}{<}^{>}-1$ to a maximum of 0.86 kPa-1$\text{kPa}{<}^{>}-1$. The hybrid sensor, integrated with capacitive and resistive sensing mechanisms in a single structure, has enhanced sensitivity and pressure measurement accuracy over a wide pressure range. This makes it suitable for various applications and addresses the limitations of existing sensors.

키워드