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Article Dans Une Revue Nature Materials Année : 2011

Room Temperature Metastability of Multilayer Graphene Oxide Films

Résumé

Graphene oxide has multiple potential 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 under- standing is crucial to enable future applications of this material. Here, a com- bined experimental and density functional theory study shows that multilayer graphene oxide produced by oxidizing epitaxial graphene via 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 intensively deprived of epoxide groups and enriched of hydroxyl groups. Our calculations show that the structural and chemical changes are driven by the availability of hydrogen in the oxidized graphitic sheets, which favors the reduction of epoxide groups and the formation of water molecules.
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Dates et versions

hal-00911814 , version 1 (30-11-2013)

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Suenne Kim, Si Zhou, Yike Hu, Muge Acik, Yves J. Chabal, et al.. Room Temperature Metastability of Multilayer Graphene Oxide Films. Nature Materials, 2011, 11, pp.544-549. ⟨10.1038/nmat3316⟩. ⟨hal-00911814⟩

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