Electronic structure and chemical properties of Pt overlayers on Nb(110)

Journal Article · Sun Mar 15 04:00:00 EST 1987 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.35.3734· OSTI ID:6884285

Pan, X; Ruckman, M W; Strongin, M

Photoemission, low-energy electron diffraction, and Auger-electron spectroscopy have been used to study the growth of Pt overlayers on Nb(110) and to determine the effect of electronic structure and overlayer morphology on surface chemical activity. It is found that Pt forms first a commensurate structure and then an incommensurate monolayer, both of which have a modified electronic structure. The Pt partial density of states is centered -2.7 eV below the Fermi level E/sub F/ and has a reduced density of states at E/sub F/. At nominal monolayer coverage the intensity of the modified Pt electronic states reached a maximum and no CO chemisorption was observed. Further deposition of Pt, above a couple of monolayers, produced a surface whose electronic structure and surface structure resembles Pt(111) and molecular chemisorption of CO on Pt was observed. Comparison of our results with data reported for Pd on other refractory metals shows that the interaction between the Pt metal overlayer and the Nb substrate produces similar chemical effects.

• Research Organization: Physics Department, Brookhaven National Laboratory, Upton, New York 11973-5000
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6884285
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 35:8; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
AUGER ELECTRON SPECTROSCOPY
CHEMICAL PROPERTIES
CHEMICAL REACTIONS
CHEMISORPTION
COATINGS
COHERENT SCATTERING
DIFFRACTION
ELECTRON DIFFRACTION
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ELEMENTS
EMISSION
ENERGY-LEVEL DENSITY
LAYERS
METALS
NIOBIUM
PHOTOEMISSION
PLATINUM
PLATINUM METALS
SCATTERING
SECONDARY EMISSION
SEPARATION PROCESSES
SORPTION
SPECTROSCOPY
SUBSTRATES
TRANSITION ELEMENTS
ULTRAHIGH VACUUM