Vibrational excitations and low-energy electronic structure of epoxide-decorated graphene

E. C. Mattson, J. E. Johns, K. Pande, R. A. Bosch, S. Cui, M. Gajdardziska-Josifovska, M. Weinert, J. H. Chen, M. C. Hersam, C. J. Hirschmugl

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Abstract

We report infrared studies of adsorbed atomic oxygen (epoxide functional groups) on graphene. Two different systems are used as a platform to explore these interactions, namely, epitaxial graphene/SiC(0001) functionalized with atomic oxygen (graphene epoxide, GE) and chemically reduced graphene oxide (RGO). In the case of the model GE system, IR reflectivity measurements show that epoxide groups distort the graphene π bands around the K-point, imparting a finite effective mass and contributing to a band gap. In the case of RGO, epoxide groups are found to be present following the reduction treatment by a combination of polarized IR reflectance and transmittance measurements. Similar to the GE system, a band gap in the RGO sample is observed as well.

Original languageEnglish
Pages (from-to)212-219
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume5
Issue number1
DOIs
Publication statusPublished - Jan 2 2014

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Keywords

  • adsorbates
  • band structure
  • epitaxial graphene
  • oxygen
  • reduced graphene oxide
  • vibrations

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

Cite this

Mattson, E. C., Johns, J. E., Pande, K., Bosch, R. A., Cui, S., Gajdardziska-Josifovska, M., Weinert, M., Chen, J. H., Hersam, M. C., & Hirschmugl, C. J. (2014). Vibrational excitations and low-energy electronic structure of epoxide-decorated graphene. Journal of Physical Chemistry Letters, 5(1), 212-219. https://doi.org/10.1021/jz4025386