Ultrasensitive embedded sensor for composite joints based on a highly aligned carbon nanotube web
Ultrasensitive embedded sensor for composite joints based on a highly aligned carbon nanotube web
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DOI：
10.1016/j.carbon.2019.04.044
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发表时间：
2019-08-01
期刊：
影响因子：
10.9
通讯作者：
Hawkins, Stephen C.
中科院分区：
文献类型：
--
作者：
Kumar, Sandeep;Falzon, Brian G.;Hawkins, Stephen C.
在这里，我们提出了一种新的方法，用于在粘接接头使用碳纳米管单层网络（CNT-SLW），这标志着一个显着的偏离分散在环氧树脂内的方法的CNTs的损伤传感。在这项工作中，从垂直排列的CNT森林中水平抽取面密度为2.0 mg/cm（2）的非常薄的高度排列的CNT-SLW（致密化厚度类似于50 nm），将其定位在粘合剂膜上，然后将其放置在两个非导电复合粘合剂之间。随后施加热和压力以固化粘合剂。这些关节进行准静态和循环加载，调查的CNT-SLW的损伤传感性能。CNT-SLW传感器，平行于负载方向放置，具有非常高的循环稳定性，以及异常高的敏感性，损伤的启动和积累。电阻增加（Δ R/R-o%类似于1633%）显著高于文献中报道的具有分散的CNT/石墨烯的粘合剂传感器的电阻增加。形态学的研究有助于解释的传感机制，通过相互作用的CNT-SLW与微裂纹的演变。这些结果表明，宏观结构的碳纳米管的潜力，与控制方向，为发展高性能的结构健康监测（SHM）系统的损伤检测。(C)2019爱思唯尔有限公司版权所有。
Herein, we present a novel approach for damage sensing in adhesively bonded joints using a carbon nanotube single layer web (CNT-SLW) which marks a significant departure from the approach of dispersing CNTs within epoxy resins. In this work, a very thin, highly aligned CNT-SLW (densified thickness similar to 50 nm) with aerial density of 2.0 mg/cm(2) was horizontally drawn from a vertically aligned CNT forest, positioned over an adhesive film, which was, in turn, placed between two non-conductive composite adherents. This was followed by the application of heat and pressure to cure the adhesive. These joints were subjected to quasi-static and cyclic loading to investigate the damage sensing performance of a CNT-SLW. The CNT-SLW sensor, placed parallel to the load direction, exhibits remarkably high cyclic stability as well as exceptionally high sensitivity to damage initiation and accumulation. The resistance increase (Delta R/R-o% similar to 1633%) is significantly higher than that of adhesive sensors with dispersed CNTs/graphene reported in the literature. Morphological studies help to explain the sensing mechanism through interactions of the CNT-SLW with the evolution of micro-cracks. These results demonstrate the potential of macroscopic architectures of CNTs, with controlled orientation, for the development of high performance structural health monitoring (SHM) systems for damage detection. (C) 2019 Elsevier Ltd. All rights reserved.