Cluster–support interaction in Au–Fe₃O₄ system

Cluster–support interaction in a Au–Fe₃O₄(001) system was studied using scanning tunneling microscopy, X-ray photoemission spectroscopy and Mössbauer spectroscopy, in situ, under ultra high vacuum conditions. Deposition of 0.02–5 monolayers of Au resulted in the growth of two- and three-dimensional...

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Bibliographic Details
Published in:Catalysis today 2011-07, Vol.169 (1), p.24-28
Main Authors: Spiridis, N, Socha, R.P, Handke, B, Haber, J, Szczepanik, M, Korecki, J
Format: Article
Language:English
Subjects:
Catalysis
catalytic activity
Chemistry
energy
Exact sciences and technology
General and physical chemistry
gold
magnetite
scanning tunneling microscopy
spectroscopy
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
X-radiation
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Summary:Cluster–support interaction in a Au–Fe₃O₄(001) system was studied using scanning tunneling microscopy, X-ray photoemission spectroscopy and Mössbauer spectroscopy, in situ, under ultra high vacuum conditions. Deposition of 0.02–5 monolayers of Au resulted in the growth of two- and three-dimensional gold nano-cluster. The positive shift of the Au 4f₇/₂ electron binding energy for the smallest clusters was correlated with modification of the electronic structure in the surface magnetite layer, as found from Mössbauer analysis, leading to conclusion that a positive charging of small Au clusters can be responsible for their outstanding catalytic activity.
ISSN:0920-5861
1873-4308
DOI:10.1016/j.cattod.2010.08.027