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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
Model reaction studies on vanadium oxide nanostructures on Pd(111).
M Kratzer1, S Surnev, F P Netzer
1Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria.
The Journal of Chemical Physics
|September 1, 2006
Summary
This study investigated deuterium interactions with vanadium oxide films on palladium. Deuterium desorption was thermalized, while water formation showed slightly higher energy, indicating energetic deuterium
Area of Science:
- Surface Science
- Heterogeneous Catalysis
- Materials Science
Background:
- Understanding surface reactions is crucial for catalysis.
- Ultrathin oxide films on metal surfaces offer tunable catalytic properties.
- Vanadium oxides are known for their catalytic activity.
Purpose of the Study:
- To study deuterium desorption and its reaction with oxygen to form water on ultrathin vanadium oxide films.
- To investigate the structural properties of vanadium oxide films on Pd(111).
- To measure the translational energy of reaction products.
Main Methods:
- Preparation of ultrathin vanadium oxide films on Pd(111) via e-beam evaporation.
- Structural characterization using low energy electron diffraction (LEED) and scanning tunneling microscopy (STM).
- Measurement of mean translational energy of desorbing species and reaction products using time-of-flight spectrometry.
Main Results:
- Identified stable vanadium oxide phases (surface-V2O3, VO, bulk V2O3) depending on film thickness and temperature.
- Desorbing deuterium species were found to be thermalized.
- Water reaction product exhibited slightly hyperthermal translational energy.
Conclusions:
- The energy distribution of desorbing deuterium suggests thermal accommodation on the oxide films.
- The slightly hyperthermal energy of water suggests energetic deuterium contributes preferentially to the reaction.
- Ultrathin vanadium oxide films on Pd(111) exhibit distinct structural phases and influence deuterium-oxygen reaction dynamics.
