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Published on: March 2, 2016
Electronic and structural shell closure in AgCu and AuCu nanoclusters
Giovanni Barcaro1, Alessandro Fortunelli, Giulia Rossi
1IPCF/CNR, Via G. Moruzzi 1, Pisa, I56124, Italy.
The Journal of Physical Chemistry. B
|November 17, 2006
Summary
Researchers explored silver-copper (AgCu) clusters, finding that polyicosahedral structures with specific ordering offer superior stability and optical properties. These findings suggest a natural growth pathway for AgCu clusters.
Area of Science:
- Materials Science
- Computational Chemistry
- Nanotechnology
Background:
- Understanding the atomic structure of bimetallic clusters is crucial for predicting their properties.
- Global optimization and density-functional theory are key methods for investigating cluster stability.
Purpose of the Study:
- To identify stable structural families of 40-atom AgCu clusters.
- To elucidate the factors governing cluster stability and potential applications.
Main Methods:
- Global optimization techniques using an atom-atom potential model.
- Density-functional methods for relaxing selected cluster structures.
Main Results:
- Polyicosahedral structures were identified as the most stable family for AgCu clusters.
- A combination of geometric and electronic shell-closure effects stabilizes these structures.
- Magic structures with core-shell ordering and high symmetry exhibit favorable optical properties.
Conclusions:
- Polyicosahedral AgCu clusters are promising for optical applications due to their stability and electronic properties.
- A natural growth pathway for AgCu clusters involves high-stability polyicosahedral structures.
- The observed effects are material-specific, as shown by comparison with AuCu clusters.
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