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Substoichiometric cobalt oxide monolayer on Ir(100)-(1 × 1).

M Gubo¹, C Ebensperger, W Meyer

¹Lehrstuhl für Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstraße 7, D-91058 Erlangen, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|August 12, 2011

Summary

Researchers created a substoichiometric cobalt oxide monolayer on an iridium surface. This ultrathin film exhibits unique pyramid structures and altered cobalt-oxygen bond lengths compared to bulk cobalt oxide.

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Area of Science:

Surface Science
Materials Science
Thin Film Chemistry

Background:

Understanding ultrathin oxide films is crucial for catalysis and electronics.
Cobalt oxide (CoO) exhibits diverse structural and electronic properties depending on its form.
Epitaxial growth of metal oxides on metal surfaces presents challenges in controlling stoichiometry and structure.

Purpose of the Study:

To synthesize and characterize a substoichiometric cobalt oxide monolayer on an Ir(100) surface.
To elucidate the atomic structure and bonding of this novel oxide phase.
To investigate the structural transformation under oxygen exposure.

Main Methods:

Substoichiometric cobalt deposition and subsequent oxidation on Ir(100).
Scanning Tunneling Microscopy (STM) for atomic-scale imaging.
Quantitative Low-Energy Electron Diffraction (LEED) for structural analysis.

Main Results:

Formation of a substoichiometric CoO monolayer with a 3x3 supercell arrangement on Ir(100).
Cobalt species occupy hollow sites with vacancies, forming oxide pyramids.
Reduced Co-O bond lengths observed compared to bulk CoO, with threefold coordination matching CoO(111) films.
Transformation to a stoichiometric c(10x2)-periodic CoO(111) layer upon oxygen exposure.

Conclusions:

The study reveals a novel substoichiometric cobalt oxide structure with unique building blocks.
The atomic arrangement and bonding in the monolayer differ significantly from bulk CoO.
The findings provide insights into the growth and structural evolution of ultrathin oxide films.