Gamma Irradiation Effects on Physical and Electronic Properties of Monolayer CVD Grown Graphene.

Abstract

Two-dimensional material graphene has proven to have remarkable electrical and photonic properties, opening the door to a wide range of uses, including employment in the harsh conditions of space. The creation of graphene on various substrate types is known to be possible via a number of approaches, including a direct deposition and the substrate transfer process. In this work, we used an argon plasma, methane as a carbon source, and a nanoCVD-8G graphene reactor to deposit monolayer gra-phene (MLG) on transition metal substrates for studying the effects of gamma irradiation on the physical and electronic proper-ties. Graphene's crystalline structure is investigated utilizing Raman and X-ray Photo Electron Spectroscopy (XPS) techniques before and after the gamma irradiation. The results show that point defects predominate in the damage following gamma irradiation. The defected structure and electronic properties are connected in the light of density functional theory (DFT) simulations of pristine and defective graphene.