AES and TDS study of CO interaction with Rh layers on Al substrate

We have evaporated Rh atoms onto polycrystalline aluminium substrate and studied the surface composition by Auger electron spectroscopy (AES). We have also explored the adsorption of CO molecules by thermal desorption spectroscopy (TDS). Both AES and TDS results exhibit dramatic changes during the s...

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Bibliographic Details
Published inVacuum Vol. 63; no. 1-2; pp. 7 - 14
Main Authors Hrnčı́ř, T, Matolı́n, V, Nehasil, V
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 02.07.2001
Elsevier
Subjects
Aluminium
Auger electron spectroscopy
Chemistry
Exact sciences and technology
General and physical chemistry
Rhodium
Solid-gas interface
Surface physical chemistry
Thermal desorption spectroscopy
Aluminium
Auger electron spectroscopy
Rhodium
Thermal desorption spectroscopy
Metallic adsorbent
Thermodesorption
Transition metal
Carbon monoxide
Platinoid
Auger electron spectrometry
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Summary:We have evaporated Rh atoms onto polycrystalline aluminium substrate and studied the surface composition by Auger electron spectroscopy (AES). We have also explored the adsorption of CO molecules by thermal desorption spectroscopy (TDS). Both AES and TDS results exhibit dramatic changes during the sample heating and CO adsorption/desorption experiments. A Rh–Al alloy is probably formed on the surface of aluminium covered by the Rh deposit if the sample is annealed at 600K. Activation energy of CO desorption is found lower than on Rh particles on Al2O3. The aluminium Auger peak shift and the oxygen Auger peak increase indicate the temperature stimulated sample oxidation. This oxidation causes an increase of the activation energy of CO desorption with respect to that observed previously on Rh particles on an Al2O3 substrate.
ISSN:0042-207X
1879-2715
DOI:10.1016/S0042-207X(01)00164-6