Nitrogen adsorption and thin surface nitrides on Cu(1 1 1) from first-principles

Aloysius Soon, Lindee Wong, Michael Lee, Mira Todorova, Bernard Delley, Catherine Stampfl

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33 Citations (Scopus)

Abstract

Experimental studies of nitrogen adsorbed on a Cu(1 1 1) surface show that the surface layer undergoes a reconstruction to form a pseudo-(1 0 0) structure. We use ab initio techniques to demonstrate the theoretical stability of this reconstructed surface phase over a range of conditions. We systematically investigate the chemisorption of N on the Cu(1 1 1) surface, from 0.06 to 1 ML coverage. A peculiar atomic relaxation of N atoms for 0.75 ML is identified, which results in the formation of a (metastable) "N-trimer cluster" on the surface. We have also investigated surface nitride formation, as suggested from experiments. A surface nitride-like structure similar to the reported pseudo-(1 0 0) reconstruction is found to be highly energetically favored. Using concepts from "ab initio atomistic thermodynamics", we predict that this surface nitride exists for a narrow range of nitrogen chemical potential before the formation of bulk Cu3N.

Original languageEnglish
Pages (from-to)4775-4785
Number of pages11
JournalSurface Science
Volume601
Issue number21
DOIs
Publication statusPublished - 2007 Nov 1

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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