Room-temperature metastability of multilayer graphene oxide films

Suenne Kim, Si Zhou, Yike Hu, Muge Acik, Yves J. Chabal, Claire Berger, Walt De Heer, Angelo Bongiorno, Elisa Riedo

Research output: Contribution to journalArticle

Abstract

Graphene oxide potentially has multiple applications. The chemistry of graphene oxide and its response to external stimuli such as temperature and light are not well understood and only approximately controlled. This understanding is crucial to enable future applications of this material. Here, a combined experimental and density functional theory study shows that multilayer graphene oxide produced by oxidizing epitaxial graphene through the Hummers method is a metastable material whose structure and chemistry evolve at room temperature with a characteristic relaxation time of about one month. At the quasi-equilibrium, graphene oxide reaches a nearly stable reduced O/C ratio, and exhibits a structure deprived of epoxide groups and enriched in hydroxyl groups. Our calculations show that the structural and chemical changes are driven by the availability of hydrogen in the oxidized graphitic sheets, which favours the reduction of epoxide groups and the formation of water molecules.

Original languageEnglish (US)
Pages (from-to)544-549
Number of pages6
JournalNature Materials
Volume11
Issue number6
DOIs
StatePublished - Jun 2012

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Kim, S., Zhou, S., Hu, Y., Acik, M., Chabal, Y. J., Berger, C., De Heer, W., Bongiorno, A., & Riedo, E. (2012). Room-temperature metastability of multilayer graphene oxide films. Nature Materials, 11(6), 544-549. https://doi.org/10.1038/nmat3316