Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/74863
Type: Artigo
Title: Surface composition and structure of palladium ultra-thin films deposited on Ni(1 1 1)
Author: Carazzolle, M. F.
Maluf, S. S.
Siervo, A. de
Nascente, P. A. P.
Landers, R.
Kleiman, G. G.
Abstract: Ultra-thin palladium films deposited on the Ni(1 1 1) surface were characterized by X-ray photoelectron spectroscopy (XPS), lowenergy electron diffraction (LEED) and X-ray photoelectron diffraction (XPD). For low coverage, LEED shows a (1 x 1) pattern similar to that of the substrate. For intermediate coverage, the LEED pattern displays extra spots around the main (1 x 1) spots, resembling a Moiré coincidence pattern, probably associated with the formation of Pd bi-dimensional islands oriented in different directions on the Ni(1 1 1) surface. The results obtained by XPS and XPD corroborate this finding. The LEED pattern displays this structure up to 500° C. Annealing at 650° C brings back the (1 x 1) pattern, which is associated with a Pd island coalescence and alloy formation by Pd diffusion in the first atomic layers of the Ni(1 1 1). In this paper we present a detailed study of this surface structure via a comparison between XPD experiment and theory.
Ultra-thin palladium films deposited on the Ni(1 1 1) surface were characterized by X-ray photoelectron spectroscopy (XPS), lowenergy electron diffraction (LEED) and X-ray photoelectron diffraction (XPD). For low coverage, LEED shows a (1 x 1) pattern similar to that of the substrate. For intermediate coverage, the LEED pattern displays extra spots around the main (1 x 1) spots, resembling a Moiré coincidence pattern, probably associated with the formation of Pd bi-dimensional islands oriented in different directions on the Ni(1 1 1) surface. The results obtained by XPS and XPD corroborate this finding. The LEED pattern displays this structure up to 500° C. Annealing at 650° C brings back the (1 x 1) pattern, which is associated with a Pd island coalescence and alloy formation by Pd diffusion in the first atomic layers of the Ni(1 1 1). In this paper we present a detailed study of this surface structure via a comparison between XPD experiment and theory.
Subject: Espectroscopia fotoeletrônica de raio X
Radiação sincrotrônica
Difração eletrônica em baixa energia
Epitaxia
Country: Holanda
Editor: Elsevier
Citation: Surface Science. Elsevier Science Bv, v. 600, n. 11, n. 2268, n. 2274, 2006.
Rights: fechado
Identifier DOI: 10.1016/j.susc.2006.03.017
Address: https://www.sciencedirect.com/science/article/pii/S0039602806003141
Date Issue: 2006
Appears in Collections:IFGW - Artigos e Outros Documentos

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