Li Min, Zuo Tianyi, Wang Shaokai, Gu Yizhuo, Gao Limin, Li Yanxia, Zhang Zuoguang
Key Laboratory of Aerospace Advanced Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing100191, People's Republic of China.
Nanotechnology. 2018 Sep 7;29(36):365702. doi: 10.1088/1361-6528/aacc58. Epub 2018 Jun 13.
This paper presents the development of a continuous carbon nanotube (CNT) composite film sensor with a strain detecting range of 0%-2% for structural composites. The strain-dependent resistance responses of continuous CNT film and its resin-impregnated composite films were investigated at temperatures as high as 200 °C. The results manifest that impregnation with resin leads to a much larger gauge factor than pristine film. Both the pristine and composite films show an increase in resistivity with increasing temperature. For different composite films, the ordering of gauge factors is consistent with that of the matrix moduli. This indicates that a resin matrix with higher modulus and strong interactions between CNTs/CNT bundles and the resin matrix are beneficial for enhancing the piezoresistive effect. The CNT/PAA composite film has a gauge factor of 4.3 at 150 °C, an order of magnitude higher than the metal foil sensor. Therefore, the CNT composite films have great potential for simultaneous application for reinforcement and as strain sensor to realise a multifunctional composite.
本文介绍了一种用于结构复合材料的连续碳纳米管（CNT）复合薄膜传感器的研发，其应变检测范围为0%-2%。研究了连续碳纳米管薄膜及其树脂浸渍复合薄膜在高达200°C温度下与应变相关的电阻响应。结果表明，树脂浸渍导致的应变片系数比原始薄膜大得多。原始薄膜和复合薄膜的电阻率均随温度升高而增加。对于不同的复合薄膜，应变片系数的排序与基体模量的排序一致。这表明，具有较高模量的树脂基体以及碳纳米管/碳纳米管束与树脂基体之间的强相互作用有利于增强压阻效应。碳纳米管/聚丙烯酸（CNT/PAA）复合薄膜在150°C时的应变片系数为4.3，比金属箔传感器高一个数量级。因此，碳纳米管复合薄膜在同时用于增强和作为应变传感器以实现多功能复合材料方面具有巨大潜力。
