E. H. Martins Ferreira

TL;DR: It is found that the ratio between the D and G peak intensities, for a given defect density, strongly depends on the laser excitation energy, and a simple equation for the determination of the point defect density in graphene via Raman spectroscopy is presented.

TL;DR: In this paper, a Raman study of Ar+-bombarded graphene samples with increasing ion doses was conducted and it was shown that the ratio between the D and G peak intensities strongly depends on the laser excitation energy.

TL;DR: In this paper, the evolution of the intensity ratio between the G band (1585 cm−1) and the disorder-induced D band (1345 cm −1) with ion dose is determined, providing a spectroscopy-based method to quantify the density of defects in graphene.

TL;DR: In this paper, the authors report on the micro-Raman spectroscopy of monolayer, bilayer, trilayer and many layers of graphene (graphite) bombarded by low-energy argon ions with different doses.

TL;DR: In this paper, Raman spectroscopy can be used to characterize the stable carbon content in a special type of soil, named Terra Preta de Indio (Indian Dark Earths).