Growth of Epitaxial Thin Pd(111) Films on Pt(111) and Oxygen-Terminated FeO(111) Surfaces

Journal Article · Fri Sep 01 04:00:00 EDT 2006 · Surface Science, 600(17):3461-3471

DOI:https://doi.org/10.1016/j.susc.2006.06.036· OSTI ID:894454

Dohnalek, Zdenek; Kim, Jooho; Kay, Bruce D

Ultra-thin Pd films (1-10 monolayers) were deposited at 30 K on a Pt(111) single crystal and on an oxygen-terminated FeO(111) monolayer supported on Pt(111). Low energy electron diffraction, Auger electron spectroscopy, and Kr and CO temperature programmed desorption techniques were used to investigate the annealing induced changes in the film surface morphology. For growth on Pt(111), the films order upon annealing to 500 K and form epitaxial Pd(111). Further annealing above 900 K results in Pd diffusion into the Pt(111) bulk and Pt-Pd alloy formation. Chemisorption of CO shows that even the first ordered monolayer of Pd on Pt(111) has adsorption properties identical to bulk Pd(111). Similar experiments conducted on FeO(111) indicate that 500 K annealing of a 10 ML thick Pd deposit also yields ordered Pd(111). In contrast, annealing of 1 and 3 ML thick Pd films did not result in formation of continuous Pd(111). We speculate that for these thinner films Pd diffuses underneath the FeO(111).

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 894454
• Report Number(s): PNNL-SA-47863; 6500; KC0301020
• Journal Information: Surface Science, 600(17):3461-3471, Journal Name: Surface Science, 600(17):3461-3471
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL GROWTH
EPITAXY
Environmental Molecular Sciences Laboratory
IRON OXIDES
MORPHOLOGICAL CHANGES
PALLADIUM
PLATINUM
SORPTIVE PROPERTIES
SUBSTRATES
THIN FILMS