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Epitaxial growth of ultrathin palladium films on Re{0001}

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Etman, H. A., Zheleva, Z. V., Held, G. and Bennett, R. A. (2011) Epitaxial growth of ultrathin palladium films on Re{0001}. The Journal of Physical Chemistry C, 115 (10). pp. 4191-4199. ISSN 1932-7447

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To link to this article DOI: 10.1021/jp112136f

Abstract/Summary

Ultrathin bimetallic layers create unusual magnetic and surface chemical effects through the modification of electronic structure brought on by low dimensionality, polymorphism, reduced screening, and epitaxial strain. Previous studies have related valence and core-level shifts to surface reactivity through the d-band model of Hammer and Nørskov, and in heteroepitaxial films this band position is determined by competing effects of coordination, strain, and hybridization of substrate and overlayer states. In this study we employ the epitaxially matched Pd on Re{0001} system to grow films with no lateral strain. We use a recent advancement in low-energy electron diffraction to expand the data range sufficiently for a reliable determination of the growth sequence and out-of-plane surface relaxation as a function of film thickness. The results are supported by scanning tunneling microscopy and X-ray photoemission spectroscopy, which show that the growth is layer-by-layer with significant core-level shifts due to changes in film structure, morphology, and bonding.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:19500
Publisher:American Chemical Society

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