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Negative Poisson's Ratio in Single-Layer Graphene Ribbons
1Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University , Shanghai 200072, People's Republic of China.
Nano Letters
|March 18, 2016
Summary
Researchers discovered negative Poisson
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Poisson's ratio describes a material's response to deformation.
- Negative Poisson's ratios (NPR) are rare in natural materials, often requiring engineered structures.
- Graphene's unique properties make it a candidate for exhibiting unusual mechanical behaviors.
Purpose of the Study:
- To investigate and report the observation of negative Poisson's ratios in single-layer graphene ribbons.
- To understand the underlying mechanism causing NPR in graphene.
- To develop a predictive model for NPR in graphene.
Main Methods:
- Simulations and theoretical analysis of single-layer graphene ribbons under tensile strain.
- Utilizing an inclined plate model to explain the observed phenomenon.
- Analyzing the relationship between ribbon width, edge warping, and Poisson's ratio.
Main Results:
- Negative Poisson's ratios were observed in single-layer graphene ribbons.
- The NPR is attributed to compressive edge stress-induced warping.
- The effect is robust for ribbons <10 nm wide and strains <0.5%, with NPR values up to -1.51.
Conclusions:
- Single-layer graphene ribbons exhibit intrinsic negative Poisson's ratios.
- An analytical inclined plate model accurately predicts NPR based on geometry.
- The interplay between ribbon width and edge warping amplitude governs the sign of the Poisson's ratio.
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