Ion irradiation of a graphene sheet can give rise to a wide range of point and extended defects on the ideal honeycomb lattice. Here we perform first-principles calculations for the determination of the electronic and transport properties of damaged graphene nanoribbons based on nonequilibrium Green function techniques. Considering a wide range of defects (vacancies, di-vacancies, Stone–Wales, sp3-type) we study the conductive characteristics, showing that the common feature in all cases is the presence of transport gaps induced by local perturbations of the wavefunction around the defected areas. However, the resonances of these pseudogaps are intrinsically related to the defect type, making possible a structural characterization of a defected graphene system based on its electrical behavior.
1 Jul 2012
Volume: 282 Pages: 108-111
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms