Atomic structures on faceted W (111) surfaces induced by ultrathin films of Pd

C. H. Nien, T. E. Madey

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Abstract

The faceting of Pd/W(111) surfaces has been studied using a Scanning tunneling microscope (STM). Three-sided pyramidal facets having {211} faces with dimensions ranging from ∼3 to 15 nm can be induced by ultrathin Pd films (≥ 1 monolayer), upon annealing to 700 K or higher. From atomic-resolution STM-images of these surfaces, we obtain direct confirmation of the {211} structure on individual facets of the 3-sided pyramids. In addition, the atomic structure of the facet edges indicates that edge energy may play a role in faceting. When the as-deposited coverage of Pd is greater than the critical value (∼1 monolayer) for inducing faceting, the extra Pd atoms diffuse to form 3-dimensional clusters, some with discernible crystalline structures, upon annealing.

Original languageEnglish
Pages (from-to)L527-L532
JournalSurface Science
Volume380
Issue number2-3
DOIs
StatePublished - 15 May 1997

Keywords

  • Faceting
  • Metallic films
  • Palladium
  • Scanning tunneling microscopy
  • Tungsten

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