Diverse reactivity patterns observed in the interaction of oxygen with nickel deposited on gold and tungsten surfaces

Kulkarni, G. U. ; Vinod, C. P. (1997) Diverse reactivity patterns observed in the interaction of oxygen with nickel deposited on gold and tungsten surfaces Applied Surface Science, 115 (4). pp. 336-341. ISSN 0169-4332

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0169-4332(97)00009-3

Abstract

Interaction of oxygen with nickel overlayers on gold and tungsten surfaces has been investigated by employing core-level spectroscopy. The Ni2p3/2 binding energy at a monolayer coverage of nickel (θNi ∼1 ML) is significantly differ compared to that at high coverages or of the bulk nickel. The Ni/Au surface showing a large negative shift in the binding energy (ΔEc ∼ −0.5 eV) adsorbs oxygen on a prolonged exposure and gives rise to a high proportion of the O1− species. In contrast, the Ni/W surface with ΔEc ∼ +0.3 eV reacts vigorously on exposure to oxygen, the O2− species being predominant on the surface. Charge transfer across the Ni/Au(W) interface is suggested to be responsible for the observed diverse reactivity patterns with oxygen. Bimetallic surfaces formed by depositing palladium on silver and tungsten surfaces also exhibit a similar behaviour.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:103416
Deposited On:15 Feb 2017 15:03
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