轻木基碳海绵/TPU复合压力传感器的制备与性能

Preparation and performance of balsa wood-based carbon sponge/TPU composite pressure sensor

近年来,具有三维网状结构的柔性压力传感器展现出高度可逆压缩性和良好灵敏性等特点,其复杂的网络形态也有利于构建稳定的导电网络,广泛应用于人体健康监测、可穿戴设备、医疗诊断等领域。本文围绕构建稳定的三维导电网络和传感性能优化为目标,设计了一种基于天然轻木的具有三维层状结构的碳海绵(CWS)/热塑性聚氨酯弹性体(TPU)复合压力传感器,并对该传感器的催化处理、碳化工艺、传感性能及人体适用性进行表征。结果表明:通过催化处理和高温碳化得到的轻木基CWS/TPU复合压力传感器,其碳化得率达到20.15%,压缩应变可达60%,在0~4 kPa压力范围内,最高压力传感灵敏度达12.87 kPa^(-1),并且在超过5000次的压缩/释放周期后仍具有良好的传感稳定性和环境稳定性,表现出良好的传感性能。应用该传感器成功地对手部活动、行走和脉搏进行了实时监测,显示了该传感器在运动和健康监测方面潜在的应用价值。

In recent years,flexible pressure sensors with three-dimensional mesh structure show high reversible compressibility and good sensitivity,and their complex network shape is also conducive to the construction of stable conductive network,which is widely used in human health monitoring,wearable devices,medical diagnosis and other fields.In this study,a carbonized wood sponge(CWS)/thermoplastic polyurethane elastomers(TPU)composite pressure sensor with three-dimensional layered structure based on natural balsa wood was designed to construct a stable three-dimensional conductive network and optimize the sensing performance.The catalytic treatment,carbonization process,sensing performance and human applicability of the sensor were characterized.The results show that the carbon yield of the light wood-based CWS/TPU sensor by catalytic treatment and high temperature carbonization can reach 20.15%,the compressive strain can reach at 60%,and the maximum pressure sensing sensitivity can reach 12.87 kPa^(−1) in the pressure range of 0-4 kPa.Moreover,the sensor still has good sensing stability and environmental stability even after 5000 compression/release cycles,showing good sensing performance.The sensor is successfully used to monitor hand movement,walking and pulse in real time,which shows the potential application value of the sensor in motion and health monitoring.