Raman spectroscopy is one of the most used characterization techniques in carbon science and technology [1,2]. The Raman spectrum of graphite and multilayer graphene (MLG) consists of two fundamentally different sets of peaks. Those, such as D, G and 2D, present also in single-layer graphene (SLG), belong to in-plane vibrations, and others, such as the shear (C) modes and the layer breathing (LB) modes, due to the relative motions of the planes themselves, either perpendicular or parallel to their normal. In NLG, all vibrational modes split due to the confinement in the direction perpendicular to the basal plane, z, and, for a given N, there are N-1 C or LB modes. Here, we will provide a brief discuss on how to determine the layer number of multilayer graphene by Raman spectroscopy via Raman modes from MLG and substrate.[3-8] 

Raman spectroscopy is one of the most used characterization techniques in carbon science and technology [1,2]. The Raman spectrum of graphite and multilayer graphene (MLG) consists of two fundamentally different sets of peaks. Those, such as D, G and 2D, present also in single-layer graphene (SLG), belong to in-plane vibrations, and others, such as the shear (C) modes and the layer breathing (LB) modes, due to the relative motions of the planes themselves, either perpendicular or parallel to their normal. In NLG, all vibrational modes split due to the confinement in the direction perpendicular to the basal plane, z, and, for a given N, there are N-1 C or LB modes. Here, we will provide a brief discuss on how to determine the layer number of multilayer graphene by Raman spectroscopy via Raman modes from MLG and substrate.[3-8]