Multi-wavelength Raman response of disordered graphitic materials: models and simulations

A model for the simulation and the interpretation of the Raman response of structurally complex carbon materials (amorphous carbon, microcrystalline graphites, disordered and nanostructured graphites) is presented. It is based on a molecular description of the material in terms of “graphitic domains”. These are characterized by the confinement of the pi electrons in two dimensions and are mimicked by using Polycyclic Aromatic Hydrocarbons. The model successfully accounts for the observed dispersion of the D line frequency in the Raman spectra of disordered graphitic materials.