Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5360748 | Applied Surface Science | 2008 | 4 Pages |
Abstract
Copper overlayer formation on the Ni(1 1 0) surface was studied by scanning tunneling microscopy (STM) in an ultrahigh vacuum. Atom-resolved STM images showed that initially deposited Cu is replaced with surface Ni atoms forming atom-size depressions on the Ni(1 1 0) terraces and a Ni-rich quasi-one-dimensional island along the [11¯0] direction. Further Cu deposition yields a mosaic structure on the islands, indicating Cu/Ni mixed layer formation. From the quantitative measurement of the Cu/Ni ratio on the substrate and the islands, impinging Cu will be replaced with surface Ni whereas expelled Ni and directly impinging Cu to the island form the mixed island. The number of Cu atoms in the islands, however, more than the directly impinging Cu, indicate significant Cu/Ni replacement at the periphery of the island.
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
T. Fukuda, K. Iwamoto, Y. Fujimoto, K. Umezawa, H. Nakayama,