The influence of tilt grain boundaries on the mechanical properties of bicrystalline graphene nanoribbons

被引：26
|
作者：
Xu, Na [1 ]
Guo, Jian-Gang [1 ,2 ]
Cui, Zhen [1 ]
机构：
[1] Tianjin Univ, Sch Mech Engn, Tianjin Key Lab Modern Engn Mech, Tianjin 300072, Peoples R China
[2] Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Peoples R China
来源：
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2016年 / 84卷
基金：
中国国家自然科学基金;
关键词：
Bicrystalline graphene; Grain boundary; Young's modulus; Ultimate strength; ELASTIC PROPERTIES; INTRINSIC STRENGTH; FAILURE; BEHAVIOR; FRACTURE; DEFECTS; FILMS;
D O I：
10.1016/j.physe.2016.06.002
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The mechanical properties of bicrystalline graphene nanoribbons with various tilt grain boundaries (GBs) which typically consist of repeating pentagon-heptagon ring defects are investigated based on the method of molecular structural mechanics. The GB models are constructed via the theory of disclinations in crystals, and the elastic properties and ultimate strength of bicrystalline graphene nanoribbons are calculated under uniaxial tensile loads in perpendicular and parallel directions to grain boundaries. The dependence of mechanical properties is analyzed on the chirality and misorientation angles of graphene nanoribbons, and the experimental phenomena that Young's modulus and ultimate strength of bicrystalline graphene nanoribbons can either increase or decrease with the grain boundary angles are further verified and discussed. In addition, the influence of GB on the size effects of graphene Young's modulus is also analyzed. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：168 / 174
页数：7
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