Journal
CARBON
Volume 44, Issue 10, Pages 1942-1948Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2006.02.024
Keywords
highly oriented graphite; surface treatment; chemisorption; texture; electrochemical properties
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We report an original approach for the preparation of quasi two-dimensional graphite sheets by exfoliation of highly oriented pyrolytic graphite. Pieces of HOPG were sonicated for variable time in aqueous solutions of phosphomolybdic acid. This leads to a gradual cleavage of the HOPG along the basal plane. The driving force of the process is the free energy resulting from the well-known strong chemisorption of phosphomolybdate ions on carbon. The resulting carbon nanostructures exhibit certain properties of the adsorbed polyoxometalate-anions. They form colloidal suspensions due to the negative surface charge and can be immobilized on surfaces containing cationic groups. (c) 2006 Elsevier Ltd. All rights reserved.
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