Figure 4.

Analysis of intensity. (a) Suspended and (b) supported graphenes. The plots of I(2D₊), I(2D₋), and I(2D₀) as functions of Φ. The symbol ‘I’ denotes the intensity of the corresponding sub-peak obtained by fitting the related Raman spectrum with a triple-Lorentzian function. The obtained intensities are shown by the dots, which are fitted by the form of Acos²(Φ − Φ₀) for I(2D₊) and I(2D₋), and of a constant of A, where A and Φ₀ are fitting parameters. The black and red lines display the fitting results.