Variations in the Nature of Metal Adsorption on Ultrathin Al{sub 2}O{sub 3} Films

Journal Article · Sat May 01 00:00:00 EDT 1999 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.82.4050· OSTI ID:348255

Bogicevic, A; Jennison, D R ^[1]

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1. Surface and Interface Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185-1413 (United States)

First-principles density-functional calculations are used to study metal adsorption (Li, K, Y, Nb, Ru, Pd, Pt, Cu, Ag, Au, and Al at (1)/(3) {endash}4 monolayer coverages) atop 5thinspthinsp{Angstrom} Al{sub 2}O {sub 3} films on Al(111). The oxide-metal bond is ionic at low coverages but, with interesting exceptions, caused by polarization at high coverages where the overlayer is metallic. Binding trends are explained in terms of simple concepts. Increasing overlayer thickness can cause the adsorbate-oxide interface structure to change, and while some metals wet, most do not. {copyright} {ital 1999} {ital The American Physical Society}

• Research Organization: Sandia National Laboratory
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 348255
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 20 Vol. 82; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
ADSORPTION
ALUMINIUM
ALUMINIUM OXIDES
CHEMICAL BONDS
COPPER
GOLD
INTERFACES
LITHIUM
NIOBIUM
PALLADIUM
PLATINUM
POTASSIUM
RUTHENIUM
SILVER
YTTRIUM