▎ 摘　　要

We performed first-principles calculations on the structural, electronic and elastic properties of graphene-like hexagonal Ti2C monolayer. Compared with the Ti2C slab in Ti2AlC, the free-standing Ti2C monolayer slightly shrinks in all directions. Ti2C monolayer exhibits a higher value of density of states at Fermi level than Ti2AlC, due to the redistribution of Ti 3d electrons near the Fermi level after the removal of Al layers from Ti2AlC. The elastic constant c(11) and c(12), in-plane Young's modulus Y-s, and Poisson's ratio v of Ti2C monolayer are found to be 137 N/m, 32 N/m, 130 N/m and 0.23, respectively. The elastic properties of Ti2C monolayer were compared with some other two-dimensional layered materials. (C) 2013 Elsevier B. V. All rights reserved.