▎ 摘　　要

We consider finite ribbons of graphene with armchair orientation of their edges to study in detail impurity effects on specific Dirac-like modes. In the framework of the Anderson hybrid model of impurity perturbation, a possibility for Mott localization and for opening of a mobility gap under local impurity perturbations is found and analyzed as a function of the model parameters: the impurity energy level, its hybridization with the host Dirac modes, and the impurity concentration. Special attention is payed to the interplay between impurity disorder and spin-orbit splitting of the host spectrum for the purpose of tunable metal-insulator phase transitions.