基于改性MWCNTs/PDMS柔性应变传感器的制备和研究

Preparation and Research of Flexible Strain Sensor Based on Modified MWCNTs/PDMS

针对当前柔性应变传感器响应范围小、灵敏度低和稳定性差等问题,以多壁碳纳米管(MWCNTs)和聚二甲基硅氧烷(PDMS)为主体材料,制备出可印刷的导电复合油墨。为了提高MWCNTs在PDMS中的分散性,以获得具有高导电性和高印刷性的导电复合油墨,用硅烷偶联剂(KH570)对MWCNTs进行改性。改性后的MWCNTs/PDMS复合材料的导电性能和印刷效果有很大程度的提升。所制备的柔性应变传感器在获得较大应变范围(160%)的同时,也具有较高的灵敏度(74.1),此外,传感器还具有较好的稳定性(可进行1000次循环加载)。将该传感器应用于人体运动监测,可准确检测到手指弯曲的变化。

Aiming at the problems of small tensile range,low sensitivity and poor stability of the existing flexible strain sensor,the printable conductive composite ink was prepared with multi-walled carbon nanotubes(MWCNTs)and polydimethylsiloxane(PDMS)as the main materials.In order to improve the dispersing ability of MWCNTs in PDMS and obtain conductive composite inks with high conductivity and high printability,MWCNTs were modified with silane coupling agent(KH570).The conductivity and printing effects of modified MWCNTs/PDMS composites were greatly improved.The prepared flexible strain sensor not only obtains a large strain range(160%),but also has high sensitivity(74.1).In addition,the sensor has good stability(can be loaded for 1000 cycles).Applying the sensor to human motion monitoring can accurately detected the changes when bending the finger.