Volume 82, Number 6, June 2008
Article Number 67004
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 04 June 2008
EPL, 82 (2008) 67004
DOI: 10.1209/0295-5075/82/67004

X-ray absorption spectroscopy of graphite oxide

H.-K. Jeong1, H.-J. Noh2, J.-Y. Kim3, M. H. Jin1, C. Y. Park1 and Y. H. Lee1

1  BK21 Physics Division, Center for Nanotubes and Nanostructured Composites, Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University - Suwon 440-746, Korea
2  Department of Physics, Chonnam National University - Gwangju 500-757, Korea
3  Pohang Accelerator Laboratory & Department of Physics, POSTECH - Pohang 790-784, Korea

received 24 March 2008; accepted in final form 5 May 2008; published June 2008
published online 4 June 2008

We have investigated the electronic structure of graphite oxide using X-ray absorption spectroscopy at the carbon and oxygen K-edges. The unoccupied $\pi$* and $\sigma$* states associated with sp2 hybridization in graphite, are also apparent in the graphite oxide, which indicates that it has a graphitic structure even though it experiences oxidation and annealing. Additional electronic states of the graphite oxide which are not present in its precursor, graphite, are ascribed to the functional groups such as epoxide, carboxyl, and hydroxyl groups.

71.20.Rv - Polymers and organic compounds.
78.70.Dm - X-ray absorption spectra.

© EPLA 2008