Chu Jingwen, Marsden Alexander J, Young Robert J, Bissett Mark A
National Graphene Institute and School of Materials , University of Manchester , Manchester , M13 9PL , U.K.
Dutch Polymer Institute , P.O. Box 902, 5600 AX Eindhoven , The Netherlands.
ACS Appl Mater Interfaces. 2019 Aug 28;11(34):31338-31345. doi: 10.1021/acsami.9b09862. Epub 2019 Aug 16.
The ability of graphene-based materials to act as strain sensors in glass fiber/epoxy model composites by using Raman spectroscopy has been investigated. The strain reporting performance of two types of graphene nanoplatelets (GNPs) was compared with that of graphene produced by chemical vapor deposition (CVD). The strain sensitivity of the thicker GNPs was impeded by their limited aspect ratio and weak interaction between flakes and fibers. The discontinuity of the GNP coating and inconsistency in properties among individual platelets led to scatter in the reported strains. In comparison, continuous and homogeneous CVD grown graphene was more accurate as a strain sensor and suitable for point-by-point strain reporting. The Raman mapping results of CVD graphene and its behavior under cyclic deformation show reversible and reliable strain sensing at low strain levels (up to 0.6% matrix strain), above which interfacial sliding of the CVD graphene layer was observed through an Raman spectroscopic study.
通过拉曼光谱研究了基于石墨烯的材料在玻璃纤维/环氧树脂模型复合材料中作为应变传感器的能力。将两种类型的石墨烯纳米片（GNP）的应变报告性能与化学气相沉积（CVD）制备的石墨烯进行了比较。较厚的GNP的应变敏感性因其有限的纵横比以及薄片与纤维之间的弱相互作用而受到阻碍。GNP涂层的不连续性以及各个薄片之间性能的不一致导致报告应变出现分散。相比之下，连续且均匀的CVD生长石墨烯作为应变传感器更准确，适用于逐点应变报告。CVD石墨烯的拉曼映射结果及其在循环变形下的行为表明，在低应变水平（高达0.6%的基体应变）下具有可逆且可靠的应变传感，高于该应变水平时，通过拉曼光谱研究观察到CVD石墨烯层的界面滑动。
