AI Article Synopsis
- The study examines the oxidation process of tiny Fe@Au core@shell clusters, less than 5 nm, using advanced electron microscopy.
- The nanoparticles are produced in superfluid helium droplets to eliminate outside influences and are then placed on a carbon surface.
- The research highlights how the gold shell protects the iron core from oxidation, revealing a specific thickness needed for this protection, and introduces a new type of structure called Fe@Au@Fe-oxide onions.
Article Abstract
The oxidation of Fe@Au core@shell clusters with sizes below 5 nm is studied high resolution scanning transmission electron microscopy. The bimetallic nanoparticles are grown in superfluid helium droplets under fully inert conditions, avoiding any effect of solvents or template structures, and deposited on amorphous carbon. Oxidation resistivity is tested by exposure to oxygen at ambient conditions. The passivating effect of Au-shells is studied in detail and a critical Au shell thickness is determined which keeps the Fe core completely unharmed. Additionally, we present the first synthesis of Fe@Au@Fe-oxide onion-type structures.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9418694 | PMC |
| http://dx.doi.org/10.1039/c9na00161a | DOI Listing |
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