Raman spectroscopy for characterization of graphene

Abstract

Raman spectroscopy is one of the most widely used characterization tool in the study of graphene, a two-dimensional hexagonal crystal of carbon atoms. Owing to the resonant nature of the light scattering process, fairly strong signals are detected in spite of the fact that only one monolayer of atoms is probed. In graphene research, Raman spectroscopy is used not only as an indispensible characterization tool to identify the number of layers, but also as a probe to investigate the mechanical, electrical, and optical properties. Here, important recent progress in Raman spectroscopic characterization of graphene is reviewed.