Negative Poisson's ratio in graphene-based carbon foams

Abstract

Using molecular dynamics simulations, we find an in-plane negative Poisson's ratio intrinsically existing in the graphene-based three-dimensional (3D) carbon foams (CFs) when they are compressed uniaxially. Our study shows that the negative Poisson's ratio in the present CFs is attributed to their unique molecular structures and triggered by the buckling of the CF structures. This novel mechanism makes the negative Poisson's ratio of CFs strongly depend on their cell length, which offers us an efficient means to tune the negative Poisson's ratio in nanomaterials. Moreover, as the buckling modes of CFs are topographically different when they are compressed in different directions, their negative Poisson's ratio is found to be strongly anisotropic, which is in contrast to the isotropic positive Poisson's ratio observed in CFs prior to the buckling. The discovery of the intrinsic negative Poisson's ratio in 3D CFs will significantly expand the family of auxetic nanomaterials. Meanwhile, the novel mechanism of nano-auxetics proposed here may open a door to manufacture new auxetic materials at the nanoscale.

References in corpus (10)

• Negative Poisson's Ratio in Single-Layer Black Phosphorus
• Novel Two-Dimensional Silicon Dioxide with in-plane Negative Poisson's Ratio
• The Ideal Tensile Strength and Phonon Instability of Borophene
• Mechanical responses of borophene sheets: A first-principles study
• Negative Poisson's Ratio in 1T-Type Crystalline Two-Dimensional Transition Metal Dichalcogenides
• Negative Poisson's Ratio in Single-Layer Graphene Ribbons
• Intrinsic Negative Poisson's Ratio for Single-Layer Graphene
• Auxetic Nanomaterials: Recent Progress and Future Development
• Stable single-layer honeycomb like structure of silica
• Electron and phonon properties and gas storage in carbon honeycomb