Figure 5.

Raman spectrum of GO prepared by Hummers method with proposed deconvolution of the D, G, D′, 2D and S3 bands. GO creates two main peaks: G (~1602 cm⁻¹), a primary in-plane vibrational mode, and 2D (2700 cm⁻¹), a second-order overtone of a different in-plane vibration, D (1350 cm⁻¹). D and 2D peak positions are dispersive (dependent on the laser excitation energy).