Reactivity of gold thin films grown on iridium:: Hydrogen dissociation

被引:11
|
作者
Okada, M
Ogura, S
Diño, WA
Wilde, M
Fukutani, K
Kasai, T
机构
[1] Osaka Univ, Grad Sch Sci, Dept Chem, Toyonaka, Osaka 5600043, Japan
[2] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan
[3] Osaka Univ, Grad Sch Engn, Dept Appl Phys, Suita, Osaka 5650871, Japan
[4] Japan Sci & Technol Agcy, Kawaguchi, Saitama 3320012, Japan
[5] De La Salle Univ, Dept Phys, Manila 1004, Philippines
关键词
gold; Iridium; hydrogen; nuclear reaction analysis; dissociative adsorption;
D O I
10.1016/j.apcata.2005.02.040
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Dissociative adsorption of H-2 (D-2) on Au thin films grown on an Ir{111} 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. H-2 (D-2) 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. (c) 2005 Elsevier B.V. All rights reserved.
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页码:55 / 61
页数:7
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