The impact of size-selected Ag clusters on graphite: an STM study

Abstract

We have used the scanning tunnelling microscope (STM) to investigate the deposition of size-selected (Ag n ) + clusters, in the size range 50-400 atoms, on highly oriented pyrolytic graphite (HOPG). The cluster morphology has been explored as a function of impact energy. For high deposition energies (∼10 eV/atom) the clusters are pinned to the surface and flattened on impact. For lower impact energies (∼1 eV/atom) the footprint of the cluster on the surface is significantly reduced. By controlling the deposition parameters clusters have also been selectively sited at surface steps. Larger particles, arising from diffusion and aggegation of deposited clusters, are visible with the scanning electron microscope (SEM) but not the STM; we find definite evidence that the interaction with the STM tip disturbs these particles.

Morphology and evolution of size-selected metallic clusters deposited on a metal surface:Ag19+/Pd(100)Félix1, Vandoni2, Massobrio3 et al. 1998Phys. Rev. B11190View full textAdd to dashboardCite

“…Recent work has used scanning tunneling microscopy to investigate the deposition of size-selected metal clusters on highly oriented pyrolytic graphite ͑HOPG͒, 8,9 and the cluster morphology has been explored as a function of impact energy. In this paper we present thermal energy atom scattering ͑TEAS͒ results on the system Ag 19 /Pd(100).…”

Shallow Implantation of “Size-Selected” Ag Clusters into Graphite

“…However, mixed systems, such as silver clusters on graphite, are more likely to have important practical applications. The graphite substrate is a model in the field of cluster physics [16,[24][25][26] and is also an important support material in catalysis [27].…”

Energetic Impact of Size-Selected Metal Cluster Ions on Graphite

“…While graphite is a natural (and popular) substrate for cluster deposition and diffusion experiments [5,[15][16][17], the impact of metal clusters on graphite has not previously been modeled. However, recent experiments [18,19] and simulations [19][20][21][22][23][24] concerned with the impact of energetic (atomic and cluster) ions on this surface provide an invaluable reference point for interpreting the novel features of the cluster-surface interaction.…”