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Diffusion of Buffer Layer Assisted Grown Gold Nanoclusters on Ru(100) and p(1 2)-O/Ru(100) Surfaces

Summary: Diffusion of Buffer Layer Assisted Grown Gold Nanoclusters on Ru(100) and
p(1 2)-O/Ru(100) Surfaces
Gabriel Kerner, Yonatan Horowitz, and Micha Asscher*
Department of Physical Chemistry, The Farkas Center for Light Induced Processes,
The Hebrew UniVersity of Jerusalem, Jerusalem 91904, Israel
ReceiVed: September 28, 2004; In Final Form: January 9, 2005
Patterning of metallic clusters on surfaces is demonstrated by utilizing a buffer layer assisted laser patterning
technique (BLALP). This method has been employed in order to measure the diffusion of AFM and STM
characterized size selected gold nanoclusters (5-10 nm diameter), over Ru(100) and p(1 2)-O/Ru(100)
surfaces. Optical linear diffraction from gold cluster coverage gratings was utilized for the macroscopic diffusion
measurements. The clusters were found to diffuse on the surface intact without significant coalescence or
sintering. The barrier for metastable gold nanocluster diffusion on the surface is thought to be lower than the
energy required for surface wetting. The apparent activation energy for diffusion was found to depend on the
cluster size, increasing from 6.2 ( 0.4 kcal/mol for 5 nm clusters to 10.6 ( 0.5 kcal/mol for 9 nm clusters.
The macroscopic diffusion of gold nanoclusters has been studied on the p(1 2)-O/Ru(100) surface as well,
where surface diffusion was found to be rather insensitive to the clusters size with activation energy of 5.5
( 1 kcal/mol. The difference between the two surfaces is discussed in terms of a better commensurability
(higher level of friction) of the gold facets at the contact area with the clean Ru(100) than in the case of the
oxidized surface.
1. Introduction


Source: Asscher, Micha - Institute of Chemistry, Hebrew University of Jerusalem


Collections: Chemistry