Investigations on supported bimetallic PdPt nanostructures

PdPt bimetallic clusters have been produced by a laser vaporisation source and studied after deposition on a support. We have been able to obtain clusters with a well-defined composition, identical to that of the target rod as deduced from energy dispersive X-ray analysis measurements. An evaporati...

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Published inSurface science Vol. 352; pp. 583 - 587
Main Authors Rousset, J.L., Khanra, B.C., Cadrot, A.M., Aires, F.J.Cadete Santos, Renouprez, A.J., Pellarin, M.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.05.1996
Elsevier
Subjects
Catalysis
Chemical Sciences
Clusters
Laser methods
Semi-empirical models and model calculations
Surface segragation
Clusters
Surface segragation
Laser methods
Semi-empirical models and model calculations
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Abstract PdPt bimetallic clusters have been produced by a laser vaporisation source and studied after deposition on a support. We have been able to obtain clusters with a well-defined composition, identical to that of the target rod as deduced from energy dispersive X-ray analysis measurements. An evaporation of Pd atoms upon the impact of the electron beam has been observed, suggesting that the surfaces of the clusters are Pd-enriched. The segregation behaviour using Monte Carlo simulations has been studied for the Pd 15Pt 85 and Pd 50Pt 50 cubo-octahedral clusters composed of 586 and 2406 atoms. The results indicate a large Pd segregation in all the systems, in qualitative agreement with the experimental observations, with preferential occupation of corner and edge sites.
AbstractList PdPt bimetallic clusters have been produced by a laser vaporisation source and studied after deposition on a support. We have been able to obtain clusters with a well-defined composition, identical to that of the target rod as deduced from energy dispersive X-ray analysis measurements. An evaporation of Pd atoms upon the impact of the electron beam has been observed, suggesting that the surfaces of the clusters are Pd-enriched. The segregation behaviour using Monte Carlo simulations has been studied for the Pd 15Pt 85 and Pd 50Pt 50 cubo-octahedral clusters composed of 586 and 2406 atoms. The results indicate a large Pd segregation in all the systems, in qualitative agreement with the experimental observations, with preferential occupation of corner and edge sites.
Author Pellarin, M.
Cadrot, A.M.
Aires, F.J.Cadete Santos
Khanra, B.C.
Rousset, J.L.
Renouprez, A.J.
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  fullname: Pellarin, M.
  organization: Laboratoire de Spectrométrie Ionique et Moléculaire, Université Claude Bernard LyonI, 43 Bd du 11 Nov. 1918, 69622 Villeurbanne Cedex, France
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Keywords Clusters
Surface segragation
Laser methods
Semi-empirical models and model calculations
Language English
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Snippet PdPt bimetallic clusters have been produced by a laser vaporisation source and studied after deposition on a support. We have been able to obtain clusters...
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SubjectTerms Catalysis
Chemical Sciences
Clusters
Laser methods
Semi-empirical models and model calculations
Surface segragation
Title Investigations on supported bimetallic PdPt nanostructures
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