Three dimensional graphene-carbon nanotube networks (3D-GC) have attracted great interests due to their superior thermal, optical, and hydrogen storage properties. In our work, the in-plane mechanical properties of nanoporous 3D-GC with different diameters of the joint carbon nanotube (CNT) and porosity have been studied. During in-plane tension, the fracture of 3D-GC first initiates at the heptagonal defects of the junctions between graphene sheets and CNTs where large tensile residual stress is observed. The in-plane tensile strength of 3D-GC decreases with the increasing of CNT parameter and porosity, and the tensile modulus is mainly determined by the porosity. Although the fracture strain decreases with the CNT diameter, it increases with the porosity. Compared to the nanoporous graphene, 3D-GC has larger in-plane tensile strength and fracture strain due to the additional support of CNTs. However, the in-plane tensile modulus of 3D-GC is usually smaller than that of the nanoporous graphene due to the wrinkled configuration of 3D-GC. By considering the stress concentration and additional support of CNTs, a theoretical model is proposed which can describe the molecular dynamics simulation results well.
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7 June 2017
Research Article|
June 02 2017
Enhanced in-plane mechanical properties of nanoporous graphene-carbon nanotube network
Huasong Qin;
Huasong Qin
1
State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University
, Xi'an 710049, China
2
Shaanxi Engineering Research Center of Nondestructive Testing and Structural Integrity Evaluation, Xi'an Jiaotong University
, Xi'an 710049, China
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Yu Sun;
Yu Sun
3
State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi'an Jiaotong University
, Xi'an 710049, China
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Jefferson Zhe Liu;
Jefferson Zhe Liu
4
Department of Mechanical and Aerospace Engineering, Monash University
, Clayton, Victoria 3800, Australia
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Yilun Liu
Yilun Liu
a)
1
State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University
, Xi'an 710049, China
2
Shaanxi Engineering Research Center of Nondestructive Testing and Structural Integrity Evaluation, Xi'an Jiaotong University
, Xi'an 710049, China
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a)
Author to whom correspondence should be addressed: yilunliu@mail.xjtu.edu.cn
J. Appl. Phys. 121, 215104 (2017)
Article history
Received:
March 21 2017
Accepted:
May 18 2017
Citation
Huasong Qin, Yu Sun, Jefferson Zhe Liu, Yilun Liu; Enhanced in-plane mechanical properties of nanoporous graphene-carbon nanotube network. J. Appl. Phys. 7 June 2017; 121 (21): 215104. https://doi.org/10.1063/1.4984762
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