Elementos de espectroscopia Raman em grafeno

Abstract

Graphene is, so far, one of the most important nanomaterials in this century. This is due to its interesting mechanical, eletro and optical properties. A good technique to study the graphene properties is the Raman spectroscopy. With this technique, we can identify aspects of graphene, as dopage, number of layers, strain, defects, energy dispersion of eletrons and phonons, and vibracional properties. This work is dedicated to present a review of the basics aspects of Raman spectroscopy in graphene. The subject is divided into three parts. The first part is dedicated to make a full, but not rigorous, presentation of Raman spectroscopy, focused on the aspects required to study graphene. In the second one, we present the main properties of graphene, as its real and recciprocal lattice, its phonons and its band structure. In third part, we discuss the relevants peaks of graphene. Into this part, we also show the modification of the graphene peaks by the influence of external factors, as doping, number of layers and strain. We also present our research, using computational methods, to identify the graphene number of layers in a stacking. It is presented, as well, our study on chemical dopage of graphene.