Figure 3.

a Raman spectra of rGO sheet (black line) and rGO-Au sheet (red line). b Raman map of rGO-Au nanocomposite constructed by integrating 1,500–1,700 cm-1 region (G band) of graphene Raman spectrum. c Raman map of the same area constructed by integrating from 1,100 to 1,200 cm-1 in which the Au nanoparticles are indicated by the bright dots.

Dong et al. Nanoscale Res Lett 2011 6:60   doi:10.1007/s11671-010-9806-8