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|Type:||Artigo de periódico|
|Title:||Surface Composition And Structure Of Nickel Ultra-thin Films Deposited On Pd(111)|
de Siervo A.
|Abstract:||Ultra-thin nickel films deposited on the Pd(111) surface were characterized by X-ray photoelectron spectroscopy (XPS), low-energy electron diffraction (LEED), and X-ray photoelectron diffraction (XPD). Up to 3 ML coverage, a LEED (1 × 1) pattern with a diffuse background due to a random distribution of Ni atoms on the surface is observed. Annealing at 600 °C reduced the background drastically and sharp (1 × 1) spots appeared on the screen, but XPS showed no presence of nickel on the surface, indicating diffusion into the bulk. Annealing at 300 °C for 30 min yielded also a sharp (1 × 1) LEED pattern, and the XPS Ni/Pd intensity ratio decreased with annealing time. The comparison between experimental and theoretical XPD results indicated that the surface was covered partially by Ni islands and partially by a random Ni-Pd surface alloy. © 2006 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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