Structural and compositional analysis of two near-surface alloys produced by adsorption and thermal decomposition of Mo(CO)6 on Ni{111)

TE Jones, TCQ Noakes, P Bailey, Christopher John Baddeley

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The adsorption and thermal decomposition of Mo(CO)(6) is reported on Ni{1 1 1}. At room temperature, Mo(CO)(6) has an extremely low sticking probability. At 450-550 K, Mo(CO)(6) adsorbs dissociatively via loss of one or more CO ligands to produce a surface intermediate stable up to about 675 K. Desorption of the remaining CO ligands leaves an essentially contaminant free NiMo surface. Two distinct NiMo near-surface alloys were synthesised by this route. These bimetallic surfaces were characterised by a combination of STM, LEED, AES, MEIS and TPD. In each case, the alloys were Ni rich and, in each case, are found to be very close to the structure of fee nickel. The first alloy gives a (3 x 3) LEED pattern and has the composition Ni8Mo. The second structure gives a (5 x 5) LEED pattern and has the composition Ni24Mo. (C) 2002 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)12-20
Number of pages9
JournalSurface Science
Volume523
Issue number1-2
DOIs
Publication statusPublished - 10 Jan 2003

Keywords

  • scanning tunneling microscopy
  • low energy electron diffraction (LEED)
  • medium energy ion scattering (MEIS)
  • catalysis
  • surface segregation
  • nickel
  • molybdenum
  • alloys
  • ENERGY ION-SCATTERING
  • ELECTRONIC-PROPERTIES
  • MO(110) SURFACE
  • NI FILMS
  • MO
  • CATALYSTS
  • HYDRODESULFURIZATION
  • HYDRODENITROGENATION
  • NANOPARTICLES
  • SEGREGATION

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