Fig. 4From: Electromagnetic Enhancement of Graphene Raman Spectroscopy by Ordered and Size-Tunable Au NanostructuresUV-vis absorption spectra of the various-sized Au nanostructures with (open symbols) and without (solid symbols) graphene coating. The Raman excitation wavelength of 514 nm is shown as a vertical dashed line, together with the corresponding wavelength of the G and 2D modes of grapheneBack to article page