A comparative study of the interaction of oxygen with clusters and single-crystal surfaces of nickel

Rao, CNR and Vijayakrishnan, V and Kulkarni, GU and Rajumon, MK (1995) A comparative study of the interaction of oxygen with clusters and single-crystal surfaces of nickel. In: Applied Surface Science, 84 (3). pp. 285-289.

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Abstract

The interaction of oxygen with Ni(lOO), (110) and (111) surfaces as well as with Ni clusters of varying sixes has been investigated by employing core-level spectroscopy. On single-crystal surfaces, the main oxygen species are $O^{1-}$ and $0^{2-}$ with characteristic O(1s) binding energies of 531 and 530 eV, the percentage of the former being \sim 30. At relatively high oxygen exposures, $Ni^{2+}$ and $Ni^{3+}$ are found on these surfaces. On the surfaces of small clusters, $O^{1-}$ is the primary product (\geq 50%) and the proportion of the $0^{2-}$ species increases with the cluster size. The small clusters distinctly show that $Ni^{2+}$ is formed first, followed by $Ni^{3+}$ at higher exposures. A sequence of transformations occurring on Ni surfaces exposed to oxygen is suggested.

Item Type:	Journal Article
Publication:	Applied Surface Science
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	27 Jun 2007
Last Modified:	19 Sep 2010 04:35
URI:	http://eprints.iisc.ac.in/id/eprint/9801

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