Abstract
X-ray photoelectron spectroscopy was used for identification of the structure and for monitoring the distribution of the carbon coating on an alumina surface synthesized by the pyrolysis of adsorbed acetylacetone. Owing to a difference in surface steady-state charging of the samples, it appeared possible to discriminate the carbon coating and carbonaceous deposits on the insulating alumina support. Carbonaceous surface species of carboxylate type were identified by detailed analysis of individual components in the experimental C 1s envelope. The surface C/Al ratio for the synthesized samples was calculated from the integral intensity of the C 1s component related to the carbon coating and the overall Al 2p envelope. It has been found that at low loading carbon is preferably concentrated at the internal surface of the alumina support. On increasing the carbon loading, the external surface of the alumina support appeared to be enriched with carbon. Copyright © 1999 John Wiley & Sons, Ltd.
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