New surfaces stabilized by adsorbate-induced faceting
New surfaces stabilized by adsorbate-induced faceting
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通过吸附物诱导的小面稳定的新表面
DOI:
10.1088/0953-8984/24/26/265003
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发表时间:
2012
期刊:
影响因子:
--
通讯作者:
T. Jacob
中科院分区:
文献类型:
--
作者:
P. Kaghazchi;I. Ermanoski;W. Chen;T. E. Madey;T. Jacob
Faceting is a form of self-assembly of single-crystal surfaces at the nanometer-scale in which an initially planar surface converts to a'hill-and-valley'structure, exposing new faces of low-index surfaces. Our recent studies revealed that, upon annealing in O 2, three-sided nanoscale pyramids form on Ir (210) exposing smooth {311} and partially restructured (110) faces. Through a combination of scanning tunneling microscopy and density functional theory, we identify this structure to be a stepped double-missing-row reconstruction, which is only stable on nanopyramidal facets, not on a planar Ir (110) surface. This faceting-enabled stabilization of a hitherto unstable surface points to a new approach to prepare nanoscale model catalysts for structure-sensitivity studies in heterogeneous (electro-) catalysis with high selectivity and reactivity.
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