The effect of chalcogens (O, S) on coarsening of nanoislands on metal surfaces

TitleThe effect of chalcogens (O, S) on coarsening of nanoislands on metal surfaces
Publication TypeJournal Article
Year of Publication2009
AuthorsShen MM, Liu DJ, Jenks CJ, Evans JW, Thiel PA
Journal TitleSurface Science
Date Published06/01
ISBN Number0039-6028
Accession NumberISI:000266786500024
Keywordsag, ag(111), chemisorption, diffusion, ethylene, molecular sulfur, oxygen, scanning tunneling microscopy, scanning-tunneling-microscopy, silver, sulphides, surface diffusion, temperature

In this article, we review some of our recent work concerning sulfur adsorption on Ag(1 1 1), and the effect of sulfur on coarsening of nanoscale Ag islands. We find that sulfur accelerates coarsening, but that a finite threshold coverage exists, below which the sulfur only decorates step edges and does not affect coarsening kinetics. Furthermore, below room temperature, and at coverages above the threshold, an ordered metal-sulfur adlayer structure develops. This structure contains long rows of Ag3S3 clusters as its dominant motif, and its development coincides with inhibition of coarsening. Taken in the context of published literature, these observations suggest that acceleration of coarsening of metal nanofeatures by adsorbed chalcogens is a general effect, and that metal-chalcogen clusters are the agents of metal mass transport. Possible models are discussed. (C) 2009 Elsevier B.V. All rights reserved.

URL<Go to ISI>://000266786500024