Zhang Zilong, Zhang Xuewei, Wang Yunlu, Wang Yang, Zhang Yang, Xu Chen, Zou Zhenxing, Wu Zehao, Xia Yang, Zhao Pei, Wang Hong Tao
Center for X-Mechanics , Zhejiang University , Hangzhou 310012 , P. R. China.
Institute of Applied Mechanics , Zhejiang University , Hangzhou 310012 , P. R. China.
ACS Nano. 2019 Sep 24;13(9):10327-10332. doi: 10.1021/acsnano.9b03999. Epub 2019 Aug 21.
Fracture behaves as one of the most fundamental issues for solid materials. As a one-atom-thick crystal, many aspects in fracture mechanics of graphene are of high significance, such as the crack propagation and its fracture toughness. Here we present a method to study the fracture characteristics of graphene using Raman spectroscopy and designed chemical-vapor-deposited monolayer graphene with preset cracks. The fracture process of graphene was experimentally observed, and its fracture toughness was obtained using Griffith's criterion based on the strain distribution derived from the frequency shifts of Raman bands. The fracture toughness of = 6.1 ± 0.6 MPa[Formula: see text] and = 37.4 ± 6.7 J/m are comparable with the previously reported theoretical and experimental values, and we believe that this simple and easy-to-operate approach of characterizing the fracture of graphene using Raman spectroscopy can also be extended to other two-dimensional materials.
断裂是固体材料最基本的问题之一。作为一种单原子厚的晶体，石墨烯断裂力学的许多方面都具有重要意义，例如裂纹扩展及其断裂韧性。在此，我们提出一种利用拉曼光谱研究石墨烯断裂特性的方法，并设计了带有预设裂纹的化学气相沉积单层石墨烯。通过实验观察了石墨烯的断裂过程，并基于从拉曼谱带频移得出的应变分布，使用格里菲斯准则获得了其断裂韧性。[具体数值]的断裂韧性为6.1±0.6MPa[公式：见原文]，断裂能为37.4±6.7J/m，与先前报道的理论和实验值相当，并且我们认为这种使用拉曼光谱表征石墨烯断裂的简单且易于操作的方法也可以扩展到其他二维材料。
