Related Experiment Video
Updated: Apr 5, 2026
08:49
Atomically Defined Templates for Epitaxial Growth of Complex Oxide Thin Films
Published on: December 4, 2014
14.9K
Epitaxial Cubic Ce2O3 Films via Ce-CeO2 Interfacial Reaction
Vitalii Stetsovych1, Federico Pagliuca2, Filip Dvořák1
1†Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, Praha 8, Czech Republic.
The Journal of Physical Chemistry Letters
|August 21, 2015
Summary
Researchers developed a new method to create ordered reduced ceria films, specifically cubic cerium sesquioxide (c-Ce2O3). This advance enables precise studies of cerium oxide (ceria) catalysts with high concentrations of oxygen vacancies.
Area of Science:
- Materials Science
- Catalysis
- Surface Science
Background:
- Reduced ceria (ceria) films on metal supports are vital for studying ceria-based catalysts.
- Oxygen vacancies in ceria significantly influence its chemical reactivity.
- Conventional methods yield disordered ceria films with increasing vacancy concentrations.
Purpose of the Study:
- To develop an alternative method for preparing ordered reduced ceria films.
- To enable well-defined studies of ceria properties under extreme reduction.
- To experimentally realize a metastable polymorph of cerium sesquioxide (Ce2O3).
Main Methods:
- Physical vapor deposition of cerium (Ce) and cerium dioxide (CeO2) films.
- Interfacial reaction between Ce and CeO2 layers.
- Characterization using surface reconstruction analysis (4 × 4 for c-Ce2O3(111)).
Main Results:
- Successfully prepared ordered, bulk-truncated layers of cubic cerium sesquioxide (c-Ce2O3).
- These c-Ce2O3 layers contain 25% ordered vacancies at the surface and subsurface.
- Identified c-Ce2O3(111) via a distinct 4 × 4 surface reconstruction.
- Observed nucleation and stabilization of c-Ce2O3 via interfacial reactions, potentially enhanced by tetragonal distortion on copper.
Conclusions:
- The new method provides ordered reduced ceria films (c-Ce2O3) for precise catalytic studies.
- This work experimentally realizes a previously unstable polymorph of Ce2O3.
- Metal-oxide interfacial reaction kinetics offer a pathway to synthesize other metastable oxide structures.
