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Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films

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Initial oxidation of the Rh(110) surface: ordered adsorption and surface oxide structures.

C Dri¹, C Africh, F Esch

¹Department of Physics, University of Trieste, I-34127 Trieste, Italy.

The Journal of Chemical Physics

|September 13, 2006

Summary

Initial oxidation of Rhodium(110) surfaces was investigated. Atomic oxygen promotes a c(2x4) surface oxide, analogous to structures on other Rh basal planes, revealing insights into Rhodium oxidation mechanisms.

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Area of Science:

Surface science
Materials science
Physical chemistry

Background:

Understanding the initial oxidation of transition metal surfaces is crucial for catalysis and materials development.
Rhodium surfaces are known for their catalytic activity, making their oxidation behavior a key research area.

Purpose of the Study:

To investigate the initial oxidation of the Rh(110) surface using experimental and theoretical methods.
To characterize the resulting surface oxide structures and compare them with other Rh basal planes.

Main Methods:

Scanning tunneling microscopy (STM) for atomic-scale surface imaging.
Core level spectroscopy (CLS) for chemical state analysis.
Density functional theory (DFT) for theoretical modeling and phase diagram prediction.

Main Results:

Exposure to molecular oxygen leads to a monolayer oxide with (10x2) and (2x1) phases.
Atomic oxygen facilitates further oxidation, forming a c(2x4) surface oxide.
The c(2x4) structure resembles hexagonal trilayer oxides found on Rh(111) and Rh(100).
Thermodynamic predictions suggest some observed phases may be kinetically hindered.

Conclusions:

The c(2x4) structure represents a stable surface oxide on Rh(110), similar to those on other Rh substrates.
Kinetic factors play a significant role in the observed surface oxide formation, potentially leading to metastable phases.
Comparison with bulk oxides (RhO2, Rh2O3) provides further context for surface oxide stability.