基于电容-电阻转换原理的柔性压力传感器

目前，基于碳基纳米材料的柔性压力传感器凭借着其便携性、柔韧性、生物相容性和低成本等特点，在智能医疗、人机交互和智能机器人等领域有着广泛的应用前景，但如何使其在具有较大量程范围的同时保持较高灵敏度，仍是一个严峻的挑战。提出一种基于氧化石墨烯/碳纳米管（Graphene Oxide/Carbon Nanotube, GO/CNT）复合敏感层的柔性压力传感器，同时以热塑性聚氨酯弹性体（Thermoplastic Polyurethanes, TPU）多孔海绵作为传感器骨架。该GO/CNT@TPU柔性压力传感器的量程范围为0～60 kPa,基于电容-电阻转换原理，当受到较小压力（0～5 kPa）时，传感器以电阻感知为主，灵敏度为0.05777 kPa^-1;当受到较大压力（5～60 kPa）时，传感器以电容感知为主，灵敏度为0.33213 kPa^-1。从而有效地实现了传感器的在宽量程内的高灵敏度检测。

Flexible Pressure Sensor Based on Capacitance-Resistance Conversion Principle

At present,with the characteristics of portability,flexibility,biocompatibility and low cost,the flexible pressure sensor based on carbon nano materials has a wide application prospect in the fields of intelligent medicine,human-computer interaction and intelligent robot.However,how to make it maintain high sensitivity with a large range is still a severe challenge.A flexible pressure sensor based on graphene oxide/carbon nanotube(GO/CNT) composite sensitive layer is proposed,and thermoplastic polyurethanes (TPU) porous sponge is used as the sensor skeleton.Based on the capacitance-resistance conversion principle,the sensitivity of the GO/CNT@TPU pressure sensor is 0.05777 kPa^-1 in the small pressure (0~5 kPa) with the resistance sensing,and the sensitivity is 0.33213 kPa^-1 in the large pressure (5~60 kPa) with the capacitive sensing,which effectively realizes the high sensitivity detection of the sensor in a wide range.