Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 355, Issue 1, Pages 179-189Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2010.11.066
Keywords
Plasma oxidation; Wet oxidation; High surface area graphite; Carbon nanofibers
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Funding
- MICINN of Spain [CTQ-2008-06839-C03-01, CTQ-2008-06839-C03-02, CTQ-2008-06839-C03 03-PPQ, EUI2008-00185, EUI2008-00205]
- CSIC [PIE-200880I069]
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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. (C) 2010 Elsevier Inc. All rights reserved.
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