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PublicationJournal of Colloid and Interface Science
Year2011
Volume335
Pages179-189
International

Surface chemical modifications induced on high surface area graphite and carbon nanofibers using different oxidation and functionalization treatments.

Authors:Ana Belén Dongil , María Belén Bachiller Baeza, Antonio Guerrero Ruiz, Inmaculada Rodríguez Ramos, Amelia Martinez Alonso , Juan Manuel D Tascón
Groups of research:Group for Molecular Design of Heterogeneous Catalysts

Two graphitic carbon materials with different edge to basal plane ratio, high surface area graphite (HSAG) and graphitized carbon nanofibers (CNFs), were oxidized by two methods, aqueous-HNO3 wet oxidation and oxygen plasma oxidation. Characterization of the materials by temperature-programmed desorption, thermogravimetry and X-ray photoelectron and Raman spectroscopies indicated that the amount and nature of oxygen surface groups introduced depended on the oxidation method and on the structure of the original material. While surface sites within the layers were only oxidized by oxygen plasma, surface sites at the edges of graphene layers were oxidized by both treatments being the wet oxidation more effective. Modification of the oxidized materials with a diamine or a triamine molecule resulted in the formation of ammonium carboxylate salt species on the carbon surface.

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