STM study of Au growth on S-modified Ru(0001)

We present results of a detailed scanning tunneling microscopy (STM) study of submonolayer nucleation and growth of two-dimensional Au islands during deposition on clean versus S-precovered Ru(0001), at room temperature. In the presence of tiny amounts of S, a dramatic increase in the mean island de...

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Bibliographic Details
Published in:Surface science 1997-08, Vol.385 (2), p.L1002-L1009
Main Authors: Hrbek, J., Schmid, A.K., Bartelt, M.C., Hwang, R.Q.
Format: Article
Language:English
Subjects:
Auger electron spectroscopy
Chemisorption
Cross-disciplinary physics: materials science
rheology
Epitaxy
Exact sciences and technology
Gold
Growth
Materials science
Methods of deposition of films and coatings
film growth and epitaxy
Nucleation
Physics
Ruthenium
Scanning tunneling microscopy
Sulfur
Surface diffusion
Surface segregation
Vacuum deposition
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Summary:We present results of a detailed scanning tunneling microscopy (STM) study of submonolayer nucleation and growth of two-dimensional Au islands during deposition on clean versus S-precovered Ru(0001), at room temperature. In the presence of tiny amounts of S, a dramatic increase in the mean island densities is observed, corresponding to a decrease in the effective mobility of Au on Ru(0001). As imaged also by STM, the structure of the S adlayer changes during Au deposition, from a dilute lattice-gas, at low Au coverages, to an increasingly denser sequence of ordered superstructure p(2 × 2), ( 3 × 3 - R 30° ) and c(2 × 4) domains, with increasing Au coverage. These findings suggest that the deposited Au atoms displace S adatoms, compressing S domains, a phenomenon consistent with a net repulsive interaction between neighboring Au and S mediated by the Ru substrate.
ISSN:0039-6028
1879-2758
DOI:10.1016/S0039-6028(97)00433-0