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Título: | Revisiting graphene oxide chemistry via spatially-resolved electron energy loss spectroscopy |
Autor: | Tararan, Anna; Zobelli, Alberto; Benito, Ana M. CSIC ORCID ; Maser, Wolfgang K. CSIC ORCID ; Stephany, Odile | Palabras clave: | Graphene oxide Energy loss spectroscopy |
Fecha de publicación: | 20-may-2016 | Editor: | American Chemical Society | Citación: | Chemistry of Materials 28(11): 3741-3748 (2016) | Resumen: | The type and distribution of oxygen functional groups in graphene oxide and reduced graphene oxide remain still a subject of great debate. Local analytic techniques are required to access the chemistry of these materials at a nanometric scale. Electron energy loss spectroscopy in a scanning transmission electron microscope can provide the suitable resolution, but GO and RGO are extremely sensitive to electron irradiation. In this work we employ a dedicated experimental set-up to reduce electron illumina- tion below damage limit. GO oxygen maps obtained at a few nanometres scale show separated domains with diferent oxidation levels. The C/O ratio varies from about 4:1 to 1:1, the latter corresponding to a complete functionalization of the graphene flakes. In RGO the residual oxygen concentrates mostly in regions few tens nanometres wide. Specific energy-loss near-edge structures are observed for diferent oxidation levels. By combining these findings with first principles simulations we propose a model for the highly oxidized domains where graphene is fully functionalized by hydroxyl groups forming a 2D-sp3 carbon network analogous to that of graphane. | Versión del editor: | http://dx.doi.org/10.1021/acs.chemmater.6b00590 | URI: | http://hdl.handle.net/10261/134887 | DOI: | 10.1021/acs.chemmater.6b00590 | ISSN: | 0897-4756 |
Aparece en las colecciones: | (ICB) Artículos |
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ChemMater_ATararan_Postprint-1.pdf | 1,79 MB | Adobe PDF | Visualizar/Abrir |
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