Second-order Overtone and Combinational Raman Modes of Graphene Layers in the Range of 1690 cm-1 to 2150 cm-1

Though graphene has been intensively studied by Raman spectroscopy, in this letter, we report a study of second-order overtone and combinational Raman modes in an unexplored range of 1690-2150 cm-1 in nonsuspended commensurate (AB-stacked), incommensurate (folded) and suspended graphene layers. Based on the double resonance theory, four d...更多