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Updated: Jun 29, 2025
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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
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Atomic Scale Insights into Reversible Oxygen Storage in Vanadium Oxide Thin Films
Ghada Missaoui1, Piotr Igor Wemhoff1, Niklas Nilius1
1Carl von Ossietzky University Oldenburg, Institute of Physics, D-26111, Oldenburg, Germany.
Summary
Monolayer vanadium oxide films on platinum can reversibly store oxygen, changing between V2O3 and V2O5 compositions. This study reveals the atomic structures involved in oxygen storage for heterogeneous catalysis.
Area of Science:
- Surface Science
- Materials Science
- Catalysis
Background:
- Vanadium oxide films on Pt(111) exhibit reversible oxygen stoichiometry.
- Understanding oxygen storage mechanisms is crucial for heterogeneous catalysis.
Purpose of the Study:
- To investigate the atomic-level structural changes during reversible oxygen uptake in VOx films on Pt(111).
- To elucidate the microscopic pathways of oxygen storage in a model catalytic system.
Main Methods:
- X-ray photoelectron spectroscopy (XPS) for quantifying oxygen storage capacity.
- Low-temperature scanning tunneling microscopy (LT-STM) for atomic-resolution imaging.
- Electron diffraction for structural analysis.
Main Results:
- Films switch between oxygen-poor (V2O3) and oxygen-rich (V2O5) phases.
- Oxygen incorporation initially forms vanadyl groups on a honeycomb lattice.
- The oxygen-rich phase features emergent V6O12 rings and disordered O-V-O trilayers.
Conclusions:
- The study reveals the microscopic mechanisms of reversible oxygen storage in VOx/Pt(111).
- This work provides fundamental insights into oxygen dynamics relevant to heterogeneous catalysis.
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