Au Nanocluster Growth on Graphene Supported on Ni(111)

TL;DR

This study investigates how gold nanoclusters grow on graphene supported on Ni(111), revealing a Volmer-Weber growth mode with size-dependent charge properties, unaffected by oxygen intercalation.

Contribution

It provides detailed insights into the growth mode and charge characteristics of Au nanoclusters on graphene on Ni(111), including effects of intercalation.

Findings

Au forms nanoclusters via Volmer-Weber growth mode.

Neutralization probability decreases with cluster size.

Oxygen intercalation does not alter growth mode.

Abstract

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