Reactivity of gold thin films grown on iridium: Hydrogen dissociation

College

College of Science

Department/Unit

Physics

Document Type

Conference Proceeding

Source Title

Applied Catalysis A: General

Volume

291

Issue

1-2

First Page

55

Last Page

61

Publication Date

9-12-2005

Abstract

Dissociative adsorption of H2 (D2) on Au thin films grown on an Ir{1 1 1} surface has been studied with temperature-programmed desorption using a quadrupole mass spectrometer and nuclear reaction analysis. Thin Au{1 1 1} films are epitaxially grown on Ir{1 1 1}, as confirmed by low-energy electron diffraction and scanning tunneling microscopy. H2 (D2) was dissociatively adsorbed on these Au{1 1 1} films, although it is well known that Au surfaces are noble enough not to dissociate hydrogen molecules. We propose a model to explain the unexpected high reactivity of the thin Au{1 1 1} surface, where narrowing of the s-band is responsible. Moreover, we found that H (D) atoms can be confined into the interface between the Ir surface and the Au thin film. We demonstrate how reactive Au thin films grown on an Ir surface are, and also compare the Au films with Ag films grown on Ir in order to test the validity/generality of our proposed model. © 2005 Elsevier B.V. All rights reserved.

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Digitial Object Identifier (DOI)

10.1016/j.apcata.2005.02.040

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