Mechanical Properties and Fracture Dynamics of Silicene Membranes

Abstract

As graphene became one of the most important materials today, there is a renewed interest on others similar structures. One example is silicene, the silicon analogue of graphene. It share some the remarkable graphene properties, such as the Dirac cone, but presents some distinct ones, such as a pronounced structural buckling. We have investigated, through density functional based tight-binding (DFTB), as well as reactive molecular dynamics (using ReaxFF), the mechanical properties of suspended single-layer silicene. We calculated the elastic constants, analyzed the fracture patterns and edge reconstructions. We also addressed the stress distributions, unbuckling mechanisms and the fracture dependence on the temperature. We analysed the differences due to distinct edge morphologies, namely zigzag and armchair.

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• Graphene healing mechanisms: A theoretical investigation
• Atomistic Representation of Anomalies in the Failure Behaviour of Nanocrystalline Silicene
• Atomistic Computational Modeling of Temperature Effects in Fracture Toughness and Degradation of Penta-graphene Monolayer
• One-dimensional Silicon and Germanium Nanostructures With No Carbon Analogues
• On the Structural Stability and Optical Properties of Germanium-based Schwarzites: A Density Functional Theory Investigation