碳纳米管纤维及其传感器力电性能实验研究

Experimental research on the mechanical and electrical properties of carbon nanotube fiber and its sensors

基于UTM T150微纳米力学测试系统搭建了纤维力电耦合测试平台,并对碳纳米管纤维进行了多组力电耦合作用下的拉伸性能实验研究。通过观察分析碳纳米管纤维的电阻-应变曲线,发现其电阻变化与应变大小密切相关,随着应变的不断变大,碳纳米管纤维的电阻也在逐渐增加。基于此,设计制作了碳纳米管纤维柔性应变传感器,并将其贴在标准试件上分别进行了弯曲变形测试、单次/循环加载性能测试以及标定实验。结果表明:当对试件进行加载时,碳纳米管纤维柔性应变传感器的电阻会随着载荷的增大而增大;当载荷逐渐消失时,其电阻会逐渐减小直至回归初始电阻值附近。这表明碳纳米管纤维具备优异的电学与力学特性,并且利用它所制作的柔性应变传感器也有着较好的灵敏度与稳定性。

In this paper,An experimental platform is built for measuring the electro-mechanical coupling effects of fibers based on UTM T150 stretching experiment system and tensile properties of carbon nanotube fiber under force and electric coupling.By observing and analyzing the resistance-strain curve,it can be found that the change of the resistance of carbon nanotube fiber is closely related to the size of the strain.The resistance of carbon nanotube fiber is gradually increases with the increase of the strain.A carbon nanotube fiber flexible strain sensor according to the characteristics of carbon nanotube fiber is designed and manufactured,and it is attached to the standard specimen for single,cyclic loading performance test and calibration test.Results show that the resistance of the flexible strain sensor of carbon nanotube fiber increases with the increase of load when the load gradually disappears,the resistance will gradually decrease until near the initial resistance value.Multiple experiments show that not only carbon nanotube fiber has excellent electrical and mechanical properties,but also the flexible strain sensors made by carbon nanotube fiber has better sensitivity and stability.