Negative Poisson’s ratio in 1T-type crystalline two-dimensional transition metal dichalcogenides

Abstract

Auxetic materials—those that expand laterally when stretched—can possess enhanced mechanical properties, including shear modulus, indentation resistance, and fracture toughness. Here the authors show that 1T-type crystalline 2D transition metal dichalcogenides exhibit intrinsic in-plane negative Poisson’s ratios.