Related Experiment Videos
Crossover from electronic to atomic shell structure in alkali metal nanowires
A I Yanson1, I K Yanson, J M van Ruitenbeek
1Kamerlingh Onnes Laboratorium, Universiteit Leiden, Postbus 9504, NL-2300 RA Leiden, The Netherlands.
Physical Review Letters
|December 12, 2001
Summary
Metallic nanowires formed during cold welding exhibit electronic shell filling effects, similar to metal clusters. This phenomenon influences nanowire stability and leads to crystalline structures with completed atomic layers for certain metals.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Cold welding creates metallic nanowires that thin to atomic dimensions before breaking.
- Previous research indicated electronic shell filling effects influence nanowire stability, analogous to metal clusters.
Purpose of the Study:
- To investigate the influence of electronic shell filling effects on metallic nanowire stability and structure.
- To complete the analogy between shell effects in metal clusters and nanowires.
Main Methods:
- Formation of metallic nanowires via cold welding of clean metal surfaces.
- Observation and analysis of nanowire thinning and stability during separation.
- Characterization of crystalline structures in larger diameter nanowires.
Main Results:
- Metallic nanowires thin down to a single atom before losing contact.
- Electronic shell filling effects were confirmed to influence nanowire stability.
- Sodium and potassium nanowires showed a crossover to crystalline structures with completed atomic layers at larger diameters.
Conclusions:
- The study confirms the analogy between electronic shell effects in metal clusters and nanowires.
- Completed atomic layers in crystalline nanowires correspond to shell closings.
- This finding provides a comprehensive understanding of shell effects in both clusters and nanowires.