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

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

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 (US)
Pages (from-to)212-219
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume5
Issue number1
DOIs
StatePublished - Jan 2 2014

Keywords

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

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