Raman Spectroscopy in Graphene-Based Systems: Prototypes for Nanoscience and Nanometrology

Figure 1

Schematic structure of graphene (left) and a achiral single-wall carbon nanotube (right). Each circle in the graphene and sphere in the nanotube represents a carbon atom. Each carbon atom is bonded to three carbon neighbours by covalent bonds. The grey plane crossing the nanotube represents a mirror symmetry which occurs in the achiral tubes [2].