Abstract
We performed STM experiments to investigate the effects of NO-CO reaction the morphology change of Pt deposited on a HOPG surface. The gasification reaction on the Pt/HOPG resulted in straight channels, multidirection channels, and circular monoatomic step pits on the basal plane. We have observed more channel formation than pit formation in the presence of platinum particles, suggesting that catalyzed gasification is much faster than noncatalyzed gasification reaction. The observed channeling structure was found to be 3 to 8 monolayers deep and is due to NO-CO reaction at higher temperature at which Pt particles attack the edges and steps of the basal plane of graphite. The unique ability of STM technique was used to resolve atomic structure of 3 to 8 monolayers deep inside channel. The corrugation width of adjacent hexagons was found to be 2.5 Å, which is in good agreement with the C-C interatomic distance in the literature.
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