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Raman Spectra of Graphite Oxide and Functionalized Graphene Sheets

Summary: Raman Spectra of Graphite Oxide and
Functionalized Graphene Sheets
Konstantin N. Kudin, Bulent Ozbas, Hannes C. Schniepp,
Robert K. Prud'homme, Ilhan A. Aksay, and Roberto Car*,
Department of Chemistry, and Department of Chemical Engineering,
Princeton UniVersity, Princeton, New Jersey 08544
Received July 26, 2007; Revised Manuscript Received October 25, 2007
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.
Motivated by the promise of graphene as an alternative to
single-wall carbon nanotubes, in recent studies, we reported1,2
a method to produce functionalized single graphene sheets
(FGSs) in bulk quantities through thermal expansion of
graphite oxide (GO). The aromaticity of the graphene sheets
is lost as epoxide and hydroxyl groups are also formed during
the oxidation process, resulting in an interlayer spacing (d-
spacing) increase from 0.34 to 0.7 nm.1


Source: Aksay, Ilhan A. - Department of Chemical Engineering, Princeton University


Collections: Materials Science