Graphene Nanopillars: Preliminary Theoretical Calculation Studies of their Structures and Electronic Properties

Abstract

We have studied the graphene nanopillar materials which have been arisen from a connecting graphene sheet and carbon nanotubes by using theoretical calculations. It was found that the structures of graphene nanopillars were depending on the size of a diameter of carbon nanotubes at its boundaries and also look sophisticated. Seamlessly joints straight structures of graphene nanopillar had numbers of heptagon ring matched an increasing of the chiral indices of carbon nanotubes. While tilted structures does not change the numbers of heptagon rings. The stability of graphene nanopillars which calculated via the formation energy has been found to be both exothermic and endothermic processes. For the properties of electronic HOMO and LUMO states, it depends on the shapes of interface between graphene and carbon nanotubes. The energy gap state of all structures shows behavior of semi-metallic which is the underestimation in electronic properties results of the density functional tight binding method.