Reactivity of gold thin films grown on iridium: Hydrogen dissociation
Reactivity of gold thin films grown on iridium: Hydrogen dissociation
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DOI：
10.1016/j.apcata.2005.02.040
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发表时间：
2005-09
影响因子：
5.5
通讯作者：
M. Okada;S. Ogura;W. Diño;M. Wilde;K. Fukutani;T. Kasai
中科院分区：
文献类型：
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作者：
M. Okada;S. Ogura;W. Diño;M. Wilde;K. Fukutani;T. Kasai
用程序升温脱附四极质谱和核反应分析研究了H2（D2）在Ir{111}表面生长的Au薄膜上的解离吸附。低能电子衍射和扫描隧道显微镜证实了在Ir{111}上外延生长了Au{111}薄膜。H2（D2）解离吸附在这些Au{111}膜上，尽管众所周知，Au表面足够高贵，不会解离氢分子。我们提出了一个模型来解释意想不到的高反应性的薄Au{111}表面，在那里的S带变窄负责。此外，我们发现，H（D）原子可以被限制在Ir表面和Au薄膜之间的界面。我们演示了如何反应Au薄膜生长在Ir表面上，并比较了Au膜与Ag膜生长在Ir上，以测试我们提出的模型的有效性/一般性。
Dissociative adsorption of H2(D2) 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{111} films are epitaxially grown on Ir{111}, as confirmed by low-energy electron diffraction and scanning tunneling microscopy. H2(D2) was dissociatively adsorbed on these Au{111} 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{111} 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.