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Surface morphology and adlayer structure of Se on Rh(111)
Shahid Iqbal1, Lingxing Zan, Elena Nardi
1Institute für Physikalische und Theoretische Chemie, Universität Bonn, Römerstr. 164, 53117 Bonn, Germany. baltruschat@uni-bonn.de.
Physical Chemistry Chemical Physics : PCCP
|February 13, 2018
Summary
Selenium (Se) deposition on Rh(111) surfaces forms smooth layers at low coverages. At higher coverages, Se deposition causes surface roughening, indicating a place exchange mechanism for adsorbed Se atoms.
Area of Science:
- Surface Science
- Electrochemistry
- Materials Science
Background:
- Understanding the initial stages of metal deposition is crucial for catalysis and materials design.
- Selenium's unique electronic properties make it an interesting adsorbate for surface studies.
Purpose of the Study:
- To investigate the submonolayer deposition of selenium (Se) on a Rh(111) surface.
- To elucidate the structural evolution and adsorption behavior of selenium during deposition.
Main Methods:
- Cyclic voltammetry was employed to study the electrochemical deposition process.
- Scanning tunneling microscopy (STM) and atomic force microscopy (AFM) were used to visualize surface structures at the atomic level.
Main Results:
- A smooth 2 × √3 adlayer structure formed up to approximately 0.5 Se coverage.
- Surface roughening initiated at monoatomic steps occurred at higher coverages and potentials around 0.55 V.
- Adsorbed Se was stable in SeO3(2-) free solutions, and Se and OH adsorbed in separate domains below 0.6 V.
Conclusions:
- The observed roughening is attributed to a place exchange mechanism, not disordered deposition.
- Surface morphology is highly dependent on Se coverage and applied potential.
- Selenium deposition significantly alters the Rh(111) surface structure.
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