Faceting Transition at the Oxide鈥揗etal Interface: (13 13 1) Facets on Cu(110) Induced by Carpet-Like Ceria Overlayer

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• 作者：Marie Aulick谩 ; Tom谩拧 Ducho艌 ; Filip Dvo艡谩k ; Vitalii Stetsovych ; Jan Beran ; Kate艡ina Veltrusk谩 ; Josef Myslive膷ek ; Karel Ma拧ek ; Vladim铆r Matol铆n
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：January 29, 2015
• 年：2015
• 卷：119
• 期：4
• 页码：1851-1858
• 全文大小：432K
• ISSN：1932-7455

文摘

Structural transitions affect electronic structure of materials and consequently their catalytic properties. We report the observation of faceting of a low index metal surface at an oxide鈥搈etal interface in a catalytically relevant system of ceria on Cu(110). We observe formation of (13 13 1) facets on the Cu(110) surface covered by ceria upon annealing above 500 掳C. The faceting transition occurs in spite of a weak adsorbate鈥搒ubstrate interaction, which manifests itself in ceria adopting a carpet-like growth mode. We rationalize the surface faceting under such conditions by oxide overlayer-induced modification of the roughening temperature of Cu(110). We describe the carpet-like ceria film in terms of elasticity theory and show that the specific structure of the ceria supported on Cu(13 13 1) can lead to a periodic modulation of the electronic structure of the ceria鈥揷opper interface. The reported structural transition indicates that surface faceting of metal can occur at the oxide鈥搈etal interface at relatively low temperatures with possible consequences for the catalytic properties of the interface. The oxide overlayer induced faceting transition can be expected to occur for other oxide鈥搈etal combinations and, as such, has perspective applications in preparation of functional oxide鈥搈etal nanostructures.