Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/59624
Type: Artigo de periódico
Title: Photoelectron diffraction study of Rh nanoparticles growth on Fe3O4/Pd(111) ultrathin film
Author: Abreu, GJP
Pancotti, A
de Lima, LH
Landers, R
de Siervo, A
Abstract: Metallic nanoparticles (NPs) supported on oxides thin films are commonly used as model catalysts for studies of heterogeneous catalysis. Several 4d and 5d metal NPs (for example, Pd, Pt and Au) grown on alumina, ceria and titania have shown strong metal support interaction (SMSI), for instance the encapsulation of the NPs by the oxide. The SMSI plays an important role in catalysis and is very dependent on the support oxide used. The present work investigates the growth mechanism and atomic structure of Rh NPs supported on epitaxial magnetite Fe3O4(111) ultrathin films prepared on Pd(111) using the Molecular Beam Epitaxy (MBE) technique. The iron oxide and the Rh NPs were characterized using X-ray photoelectron spectroscopy (XPS), low-energy electron diffraction and photoelectron diffraction (PED). The combined XPS and PED results indicate that Rh NPs are metallic, cover approximately 20 % of the iron oxide surface and show height distribution ranging 3-5 ML (monolayers) with essentially a bulk fcc structure.
Subject: Oxide
Fe3O4
Magnetite
SMSI
Surface
Thin film
Rhodium
Catalyst
XPS
LEED
PED
Country: Holanda
Editor: Springer
Rights: fechado
Identifier DOI: 10.1007/s11051-013-1510-z
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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