▎ 摘　　要

We study s-wave superconductivity state in doped graphene within the extended attractive Hubbard model and BCS theory. We use the Green's function approach and coherent potential approximation. We obtain critical temperature of graphene, T-c as a function of the impurity concentration, c, as well as impurity strength, delta. The results show that when c and delta, are increased, T-c remains finite and doped graphene can be a superconductor. (C) 2010 Elsevier B.V. All rights reserved.