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Raman spectra of graphite oxide and functionalized graphene sheets
Konstantin N Kudin1, Bulent Ozbas, Hannes C Schniepp
1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.
Abstract:
We investigate Raman spectra of graphite oxide and functionalized graphene sheets with epoxy and hydroxyl groups and Stone-Wales and 5-8-5 defects by first-principles calculations to interpret our experimental results. Only the alternating pattern of single-double carbon bonds within the sp2 carbon ribbons provides a satisfactory explanation for the experimentally observed blue shift of the G band of the Raman spectra relative to graphite. To obtain these single-double bonds, it is necessary to have sp3 carbons on the edges of a zigzag carbon ribbon.
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