SSIMS and XPS Studies of Reconstruction of Alumina-Supported Rh Particles

I. Stará (), J.-P. Di Salvo, V. Nehasil, V. Matolín and E. Gillet
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I. Stará: SERMEC, Case 261, Faculté des Sciences et Techniques de Saint-Jérôme, 13397 Marseille Cedex 20, France
J.-P. Di Salvo: SERMEC, Case 261, Faculté des Sciences et Techniques de Saint-Jérôme, 13397 Marseille Cedex 20, France
V. Nehasil: SERMEC, Case 261, Faculté des Sciences et Techniques de Saint-Jérôme, 13397 Marseille Cedex 20, France
V. Matolín: SERMEC, Case 261, Faculté des Sciences et Techniques de Saint-Jérôme, 13397 Marseille Cedex 20, France
E. Gillet: SERMEC, Case 261, Faculté des Sciences et Techniques de Saint-Jérôme, 13397 Marseille Cedex 20, France

Surface Review and Letters (SRL), 1998, vol. 05, issue 01, 375-379

Abstract: Rhodium particles were vapor-deposited on (-1012) α-alumina and polycrystalline γ-alumina substrates. Variations of morphological parameters during the growth and/or thermal annealing in vacuum, oxygen and CO atmosphere have been investigated by means of static SIMS and XPS. The ratios of Rh/substrate ion species and the Rh 3d electron binding energy variations indicated changes in metal coverage given by particle size and dispersion variations. The heating of as-deposited particles in vacuum led to the particle coalescence. On the other hand the oxygen interactions with particles gave an increase of particle dispersion.

Date: 1998
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DOI: 10.1142/S0218625X98000694

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