Carbon layer formation on the Pt (111) surface as a function of temperature

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Abstract
The (111) surfaces of carbon-doped Pt single crystals were studied using LEED and Auger spectroscopy to determine the characteristics of carbon segregation of platinum. Carbon was observed to appear on the surface reversibly when the crystals were cooled. Observations of coverage versus temperature, carbon Auger peak shapes, and LEED patterns indicate that the appearance of carbon on Pt(111) can be explained solely by precipitation and that segregation of carbon does not occur on this surface to within the limit of detectability. The fact that no detectable segregation is observed indicates that single carbon atoms are not appreciably more strongly bound on the Pt(111) surface than in the interior of the crystal and that the bonding of a single graphite layer to the Pt(111) surface is weaker than the interlayer bonding of carbon in bulk graphite.

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