sentences:  The aforementioned results were obtained within the nearest-neighbor approximation of the tight-binding model neglecting the excitonic effects.First-principle calculations with quasiparticle corrections and many-body effects explored the electronic and optical properties of graphene-based materials.With GW calculation, the properties of graphene-based materials are accurately investigated, including graphene nanoribbons, edge and surface functionalized armchair graphene nanoribbons and scaling properties in armchair graphene nanoribbons.