Volume 71, Number 2, July 2005
|Page(s)||276 - 282|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||15 June 2005|
Making a noble metal of
Institute of Physics, Technische Universität Clausthal D-38678 Clausthal-Zellerfeld, Germany
2 Department of Physics, University of South Africa - Unisa 0003, South Africa
3 Faculty of Physics, Warsaw University of Technology Koszykowa 75, 00-662 Warsaw, Poland
Corresponding author: firstname.lastname@example.org
Accepted: 18 May 2005
We present theoretical and experimental data concerning the possibility of inducing in properties characteristic of a noble metal. A free-standing monolayer expanded to the lattice constant of 3.30 exhibits an atomic-like electronic structure, having its d-valence states almost full, like the noble metals , or . To prevent de-population of the d-states, we deposit the ML on a substrate passivated by a pseudomorphic monolayer. The weak interaction with the -capped surface causes the centre of the d-states of the monolayer to lie much closer to the Fermi level than in bulk . As a result, the weakly bonded monolayer becomes more reactive than bulk . However, when is deposited directly on the surface, the strong, direct bonds between and push the d-band centre of the monolayer toward lower binding energies, resulting in reactivity comparable to that of the noble metal .
PACS: 68.43.-h – Chemisorption/physisorption: adsorbates on surfaces / 82.80.Pv – Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.) / 73.20.At – Surface states, band structure, electron density of states
© EDP Sciences, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.