纳米纤维膜基柔性压力传感器的优化设计制备

为获得一种灵敏度高、制备工艺简单、轻薄透气的柔性压力传感器,采用静电纺丝热塑性弹性体聚氨酯(TPU)纳米纤维膜为基底和介电层,以碳纳米管导电油墨为电极涂料,通过超声波焊接方式制备三明治结构的纳米纤维膜基柔性压力传感器,并研究其压力传感性能与纳米纤维膜厚度和微观结构之间的关系。结果表明:随着纺丝时间增加,TPU纳米纤维膜厚度增加,拉伸应力增大,断裂伸长率减小;在9.8~49 000 Pa压力范围内,TPU纳米纤维膜基柔性压力传感器灵敏度随纺丝时间增加而减小,当纺丝时间为1 h时,其灵敏度高达4.97 kPa^-1,该纳米纤维膜基柔性压力传感器具有灵敏度高、响应范围广的特点。

Optimization design and preparation of nanofiber membrane based flexible pressure sensor

In order to obtain a flexible pressure sensor with high sensitivity, simple preparation process, light weight and air permeability, thermoplastic elastomer polyurethane (TPU) electrospun nanofiber membrane was used as a substrate and a dielectric layer and carbon nanotube conductive ink was used as an electrode coating to prepare a sandwich-structured nanofiber membrane-based flexible pressure sensor by ultrasonic welding. The relationship between pressure sensing properties and nanofiber membrane thickness and microstructure was studied. The results show that with the increasing of spinning time, the thickness and the tensile stress of the nanofiber membrane increase, while the elongation at break decreases. In the pressure range of 9.8-49 000 Pa, the sensitivity of the device decreases with the increase of the spinning time. When the spinning time is 1 h, the sensitivity of the device is up to 4.97 kPa^-1. The nanofiber membrane-based flexible pressure sensor has the characteristics of high sensitivity and wide response range.