▎ 摘　　要

Surface enhanced Raman spectrum of graphene was obtained by modifying graphene with Ag nano-particles. The doublet of D band and 2D band was observed due to surface enhanced Raman scattering (SERS) enhancement and relaxation of the selection rules originated from the interaction of Ag nano-particles and graphene. The difference in the doublet of D band in which the separation between the two peaks is 11 cm(-1) is close to the theoretical value of 9 cm(-1) and can be attributed to the disorder and edge effect. The doublet of 2D band can be assigned to the asymmetry of dispersion relation along KM and K Gamma respectively. The phonon mode at 1510 cm(-1) can be associated with the iTO phonon near Gamma K/4. This confirms the phonon dispersion based on double resonance (DR) theory in iTO branch. (C) 2013 Elsevier Ltd. All rights reserved.