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Published on: July 24, 2015
Negative Poisson's ratio in rippled graphene
Huasong Qin1, Yu Sun2, Jefferson Zhe Liu3
1State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an, China 710049. yilunliu@mail.xjtu.edu.cn.
Rippled graphene exhibits a tunable Poisson's ratio, becoming negative with increased ripple amplitude. This auxetic behavior, combined with excellent mechanical properties, suggests potential for advanced nanomaterials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Graphene's atomic thinness leads to out-of-plane ripples.
- Topological defects in graphene generate ripples to relieve deformation energy.
Purpose of the Study:
- Investigate the influence of ripples on graphene's Poisson's ratio.
- Explore the mechanical properties and potential applications of rippled graphene.
Main Methods:
- Molecular dynamics (MD) simulations were employed.
- Simulations analyzed the effect of ripple aspect ratio (η) on Poisson's ratio.
Main Results:
- Poisson's ratio of rippled graphene decreases with increasing aspect ratio (η).
- A negative Poisson's ratio of -0.38 was observed for η = 0.188 at 8% strain.
- Ripples flatten under tension, influencing the overall Poisson's ratio.
Conclusions:
- Rippled graphene displays tunable auxetic behavior due to de-wrinkling effects.
- Rippled graphene possesses excellent fracture strength and toughness.
- Potential applications in nano-devices and nanomaterials are indicated.
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