棉/Ti3C2导电纱制备及其电容式压力传感器的性能

为了探究类石墨烯二维结构材料(MXene)与天然纤维的结合效果,及其所得导电纱线在柔性电容式传感器中的应用情况,以一种新型二维过渡金属碳化物Ti₃C₂为导电材料、以棉纱为基体纤维,实现了导电纱线的连续化制备;然后以此导电纱线为电极、以横编间隔织物为介电层,设计了一款电容式压力传感器。研究了处理时间对纱线微观形貌、结合效果以及导电性能的影响;分析了该压力传感器的力学性能与电容特性。实验结果表明:随着处理时间的延长,Ti₃C₂材料与棉纱复合得到的纱线电导率可达0.872 S/cm;制备的传感器压缩回复性好、电容特性显著,灵敏度最高达到0.028 kPa^-1,能在150 ms内对压力快速响应,200次压缩循环中展现了良好的耐久性与稳定性。

Preparation of cotton/Ti3C2 conductive yarn and performance of pressure capacitance sensor

The paper aims to explore the combination effect of two-dimensional transition metal carbide/nitride(MXene) and natural fibers so as to devise capacitive flexible sensing fabric with a simplified preparation process by knitting. In the experiment, a new two-dimensional transition metal carbide Ti₃C₂ was used as the conductive material, and cotton yarn as matrix fiber to achieve the continuous preparation of conductive yarns. A cross structure capacitive pressure sensor was designed with a flat-knitting spacer fabric as dielectric layer and conductive yarns as electrodes. The effects of treatment time on the micro morphology, bonding effect and electrical conductivity of the yarns were studied, and the mechanical properties and capacitance characteristics of the pressure sensor were analyzed. The experimental results show that the conductivity of the composite yarn of Ti₃C₂ material and cotton yarn reach 0.872 S/cm. The prepared sensor has good compression recovery, and remarkable capacitance characteristics. The highest sensitivity is 0.028 kPa^-1, the response time is less than 150 ms, demonstrating durability and stability of the sensor after 200 compression cycles.