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Low energy alkali ion scattering is used to investigate the deposition of Auonto a single layer of graphene grown onto Ni(111) by chemical vapordeposition. The yield of 3.0 keV Na$^+$ singly scattered from Au as a functionof coverage indicates that it grows in a Volmer-Weber mode forming nanoclustersthat increase in size with the amount of deposition. The neutralizationprobability of the scattered Na$^+$ is high for the smallest clusters anddecreases as they increase in size. This is presumably caused by the clusteredge atoms being positively charged combined with the fact that the ratio ofedge to center atoms decreases with size, which is similar to the behavior ofAu nanoclusters on oxide substrates. In addition, oxygen is intercalated underthe graphene film to decouple it from the substrate, but no changes in thegrowth mode or neutralization probability are observed.

Au Nanocluster Growth on Graphene Supported on Ni(111)