期刊论文详细信息
SURFACE SCIENCE 卷:608
Surface Structure Spread Single Crystals (S4C): Preparation and characterization
Article
de Alwis, A.1  Holsclaw, B.1  Pushkarev, V. V.1  Reinicker, A.1,2  Lawton, T. J.3  Blecher, M. E.3  Sykes, E. C. H.3  Gellman, A. J.1,2 
[1] Carnegie Mellon Univ, Dept Chem Engn, Pittsburgh, PA 15213 USA
[2] US DOE, Natl Energy Technol Lab, Pittsburgh, PA 15236 USA
[3] Tufts Univ, Dept Chem, Medford, MA 02155 USA
关键词: Surface structure;    Structure sensitivity;    STM;    Single crystal;    High Miller index;   
DOI  :  10.1016/j.susc.2012.09.015
来源: Elsevier
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【 摘 要 】

A set of six spherically curved Cu single crystals referred to as Surface Structure Spread Single Crystals ((SCs)-Cs-4) has been prepared in such a way that their exposed surfaces collectively span all possible crystallographic surface orientations that can be cleaved from the face centered cubic Cu lattice. The method for preparing these (SCs)-Cs-4 and for finding the high symmetry pole point is described. Optical profilometry has been used to determine the true shapes of the (SCs)-Cs-4 and show that over the majority of the surface, the shape is extremely close to that of a perfect sphere. The local orientations of the surfaces lie within +/- 1 degrees of the orientation expected on the basis of the spherical shape; their orientation is as good as that of many commercially prepared single crystals. STM imaging has been used to characterize the atomic level structure of the Cu(111) +/- 11 degrees-(SC)-C-4. This has shown that the average step densities and the average step orientations match those expected based on the spherical shape. In other words, although there is some distribution of step-step spacing and step orientations, there is no evidence of large scale reconstruction or faceting. The Cu (SCs)-Cs-4 have local structures based on the ideal termination of the face centered cubic Cu lattice in the direction of termination. The set of Cu (SCs)-Cs-4 will serve as the basis for high throughput investigations of structure sensitive surface chemistry on Cu. (C) 2012 Elsevier B.V. All rights reserved.

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