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Issue 30, 2013
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Surface structure of Pd(111) with less than half a monolayer of Zn

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Abstract

We have characterized the structural properties of submonolayer amounts of Zn on Pd(111) using scanning tunneling microscopy (STM) and spot-profile analysis low energy electron diffraction (SPA-LEED). Following room temperature deposition of ≈0.06 monolayers (ML) Zn onto Pd(111), we observe the substitution of Zn for Pd in the surface layer. At ≈0.20 ML of deposited Zn, STM reveals a locally ordered phase with a Image ID:c3cp50793a-t1.gif unit cell located near Zn substitutions; SPA-LEED patterns reveal the same periodicity. We attribute this phase to the metastable bonding of atoms or clusters predominantly in hollow sites surrounding Zn substitutions in the surface layer. At ≈0.4 ML, STM images reveal local Image ID:c3cp50793a-t2.gif and (2 × 1) ordering on surfaces annealed to 350 K. At coverages near 0.5 ML, both STM and SPA-LEED show the onset of the formation of the (2 × 1) ordering associated with the Zn : Pd 1 : 1 alloy phase. At all coverages, the surface is dominated by island growth; the islands' size and density is shown to depend critically on annealing at temperatures as low as 350 K. These results provide insight into the structural features of a Zn/Pd(111) coverage regime that has been much debated in recent years.

Graphical abstract: Surface structure of Pd(111) with less than half a monolayer of Zn

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Supplementary files

Article information


Submitted
21 Feb 2013
Accepted
26 Apr 2013
First published
26 Apr 2013

Phys. Chem. Chem. Phys., 2013,15, 12488-12494
Article type
Paper

Surface structure of Pd(111) with less than half a monolayer of Zn

J. M. MacLeod, J. A. Lipton-Duffin, A. Baraldi, R. Rosei and F. Rosei, Phys. Chem. Chem. Phys., 2013, 15, 12488
DOI: 10.1039/C3CP50793A

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