Laser power influence on Raman spectra of multilayer graphene, multilayer graphene oxide and reduced multilayer graphene oxide

Abstract

In this work, the influence of laser power on Raman spectra on different carbon based materials was studied: multilayer graphene (MLG), multilayer graphene oxide (MLGO) and reduced multilayer graphene oxide (rMLGO). The presence of oxygen and hydrogen was verified by means of Fourier-transform Infrared Spectroscopy, indicating that our oxidation and reduction process was success in our multilayers graphene. Through the position and width of the band G, we discuss the effects of the incorporation of oxygen by the graphene matrix in terms of thermal expansion and doping effects. The ID/IG ratio was used to determine the presence of defects and showed a similar behavior for MLGO and rMLGO demonstrating a feature of partial reduction and reduction effects caused by the power supplied by laser.