Initial Formation of Positively Charged Gold on MgO(001) Thin Films: Identification by Experiment and Structural Assignment by Theory

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• 作者：Matthew A. Brown ; Franziska Ringleb ; Yuichi Fujimori ; Martin Sterrer ; Hans-Joachim Freund ; Gloria Preda ; Gianfranco Pacchioni
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：May 26, 2011
• 年：2011
• 卷：115
• 期：20
• 页码：10114-10124
• 全文大小：1117K
• 年卷期：v.115,no.20(May 26, 2011)
• ISSN：1932-7455

文摘

Infrared spectroscopy experiments using CO as a probe and X-ray photoelectron spectroscopy were used to study the initial nucleation of gold on the surface of MgO(001)/Ag(001) thin films at 90 K. The most intense CO infrared signal observed at low gold coverage was at 2154 cm^鈥?, indicating the formation of positively charged Au species. Both infrared and photoemission data reveal details about the thermally induced sinter behavior of metallic and positively charged gold species on the MgO(001) surface. Density functional theory was used to examine different defect types on the MgO surface for their ability to form positively charged Au species and to assign the observed IR stretch vibration to Au_n⁺鈥揅O species on specific binding sites on the MgO(001) surface.