Propagation of a reaction front accompanied by island formation: CO/Au/Ni(111)

被引:14
作者
Zhdanov, Vladimir P. [1 ]
Vang, Ronnie-T.
Knudsen, Jan
Vestergaard, Ebbe K.
Besenbacher, Flemming
机构
[1] Russian Acad Sci, Boreskov Inst Catalysis, Novosibirsk 630090, Russia
[2] Aarhus Univ, Interdisciplinary Nanosci Ctr, NANO, DK-8000 Aarhus C, Denmark
[3] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark
关键词
kinetics; surface chemical reaction; surface diffusion; nanopatterning; lateral interactions; low index single crystal surfaces; steps; Ni(111); Au; CO; computer simulations;
D O I
10.1016/j.susc.2006.07.056
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
Recent high-pressure scanning tunneling microscopy studies, performed at room temperature, have explicitly demonstrated the specifics of the CO-mediated removal of Ni atoms from the topmost layer of an Au/Ni(111) surface alloy. After an incubation period, the reaction is found to start at step edges. On each edge, a large fraction of Ni atoms is removed from the terrace in certain areas, whereas other areas are nearly intact after a given time. With increasing time, the former areas begin to overlap and the reaction front becomes somewhat more homogeneous. The Au atoms remaining behind the front form nm-sized islands. Here, we present Monte Carlo simulations reproducing all these observations. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:L260 / L264
页数:5
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