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Two dimensional allotropes of group IV substrates including silicene,germanene and stanene have recently attracted considerable attention innanodevice fabrication industry. These materials involving the buckledstructure have been experimentally fabricated lately. In this study, firstprinciples density functional theory calculations were utilized to investigatethe mechanical properties of single layer and free standing silicene, germaneneand stanene. Uniaxial tensile and compressive simulations were carried out toprobe and compare stress strain properties; such as the Young modulus, Poissonratio and ultimate strength. We evaluated the chirality effect on themechanical response and bond structure of the 2D substrates. Our firstprinciples simulations suggest that in all studied samples application ofuniaxial loading can alter the electronic nature of the buckled structures intothe metallic character. Our investigation provides a general but also usefulviewpoint with respect to the mechanical properties of silicene, germanene andstanene.

First-principles investigation of mechanical properties of silicene, germanene and stanene