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Endotaxial silicide nanowires.
Zhian He1, David J Smith, P A Bennett
1Science and Engineering of Materials Program, Arizona State University, Tempe, Arizona 85287-1504, USA.
Physical Review Letters
|February 9, 2005
Summary
Researchers grew cobalt silicide nanowires on silicon substrates using a novel endotaxial mechanism. The nanowire shape is kinetically controlled by growth temperature, offering potential for other material systems.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Science
Background:
- Self-assembled nanostructures are crucial for advanced electronic and magnetic devices.
- Controlling nanowire morphology is essential for tailoring their properties.
Purpose of the Study:
- To demonstrate the growth of self-assembled cobalt silicide nanowires on various silicon substrates.
- To elucidate the growth mechanism and factors influencing nanowire shape.
Main Methods:
- Deposition of cobalt (Co) onto heated silicon (Si) substrates with different crystallographic orientations (Si(111), (100), (110)).
- Analysis of island formation and growth using an endotaxial mechanism along inclined Si{111} planes.
Main Results:
- Successfully grew cobalt silicide nanowires via a self-assembling endotaxial growth process.
- Observed that nanowire dimensions (length and width) increase proportionally over time.
- Demonstrated that nanowire shape is kinetically determined, strongly influenced by growth temperature.
Conclusions:
- The endotaxial mechanism provides a pathway for forming self-assembled nanowires in overlayer/substrate systems.
- Kinetic control offers a method for tailoring nanowire morphology.
- This approach is potentially applicable to a wide range of material combinations for nanodevice fabrication.