A Low-Energy Ion Scattering Approach for Studying Au Nanoclusters Grown on an H2 O Buffer Layer

Langmuir : the ACS Journal of Surfaces and Colloids
C R Salvo, J A Yarmoff

Abstract

A novel form of alkali low-energy ion scattering is used to probe the deposition of nanoclusters onto a solid surface via buffer layer assisted growth (BLAG) in ultrahigh vacuum. A thin amorphous solid water (ASW) buffer layer is grown on a TiO2(110) single crystal cooled to 100 K. Au atoms deposited onto this layer arrange themselves into nanoclusters. The sample is then annealed to 320 K to desorb the ASW and enable the clusters to soft-land onto the substrate. Time-of-flight low-energy ion scattering, using Li+, Na+, and K+ projectiles, probes the materials during each step of the BLAG process to measure the surface composition and reveal the details of how the clusters form. The neutralization probability of Na+ ions singly scattered from the Au nanoclusters indicates that they increase in size after annealing and that the magnitude of the increase is a function of the buffer layer thickness. The adsorption of a thin, incomplete water layer prior to Au deposition forms nanoclusters that are possibly even smaller than those produced by direct deposition onto the clean substrate.

References

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Aug 21, 1995·Physical Review Letters·C A KellerB H Cooper
Jul 13, 2004·Physical Review Letters·G F LiuJ A Yarmoff
Sep 7, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Elad GrossMicha Asscher
Jun 21, 2006·The Journal of Chemical Physics·Ana Rita Canário, Vladimir A Esaulov
Jul 3, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Elad Gross, Micha Asscher

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