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| - Diffusion of Buffer Layer Assisted Grown Gold Nanoclusters on Ru(100) andp(1 × 2)-O/Ru(100) Surfaces
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| - Patterning of metallic clusters on surfaces is demonstrated by utilizing a buffer layer assisted laser patterningtechnique (BLALP). This method has been employed in order to measure the diffusion of AFM and STMcharacterized 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 diffusionmeasurements. The clusters were found to diffuse on the surface intact without significant coalescence orsintering. The barrier for metastable gold nanocluster diffusion on the surface is thought to be lower than theenergy required for surface wetting. The apparent activation energy for diffusion was found to depend on thecluster 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 theoxidized surface.
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