Dynamic transformation between bilayer islands and dinuclear clusters of Cr oxide on Au(111) through environment and interface effects.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 35605120.
- Also identified by DOI 10.1073/pnas.2120716119 and PMC identifier 9295788.
- Licence recorded as CC BY-NC-ND.
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Abstract
SignificanceFor oxide catalysts, it is important to elucidate and further control their atomic structures. In this work, well-defined CrO<sub>2</sub> bilayer islands and Cr<sub>2</sub>O<sub>7</sub> dinuclear clusters have been grown on Au(111) and unambiguously identified by scanning tunneling microscopy and theoretical calculations. Upon cycled redox treatments, the two kinds of oxide nanostructures can be reversibly transformed. It is interesting to note that both Cr oxides do not exist in bulk but need to be stabilized by the metal surface and the specific environment. Our results suggest that both redox atmosphere and interface confinement effects can be used to construct an oxide nanostructure with the specific chemical state and structure.