Possibility of Determining the Graphene Doping Level Using Raman Spectra

Raman spectroscopy was used to study the structure of graphene synthesized from methane by chemical vapor deposition at atmospheric pressure and transferred to a SiO2/Si substrate using various transfer and polymer-removal methods. It was found that the dependences of the 2D peak positions on the G peak positions of the studied samples were well-behaved linear functions with slopes of ~2.2 that suggested the existence of biaxial stress in the graphene. It was discovered that the doping in the samples changed.