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Kinetic competition model and size-dependent phase selection in 1-D nanostructures
Yu Chen1, Yung-Chen Lin, Chun-Wei Huang
1Department of Materials Science and Engineering, University of California, Los Angeles, California 90095, United States.
Nano Letters
|May 2, 2012
Summary
The first phase formed in nickel-silicon nanostructures depends on size and temperature. Nanowire phase formation differs from thin films due to unique structural properties.
Area of Science:
- Materials Science
- Nanotechnology
- Microelectronics Engineering
Background:
- Phase formation sequences are critical for microelectronics.
- Traditional models fail for 1-D nanostructures due to scaling effects.
Purpose of the Study:
- Investigate the size-dependent first phase formation sequence in 1-D nickel-silicon nanostructures.
- Understand deviations from bulk and thin-film behavior.
Main Methods:
- Utilized nickel-silicon as a model system.
- Employed in situ transmission electron microscopy for kinetic studies.
- Developed a modified kinetic growth competition model.
Main Results:
- NiSi(2) becomes the dominant first phase in 1-D nanostructures due to absent grain boundaries.
- θ-Ni(2)Si emerges as the first phase in small diameter nanowires at higher temperatures.
- Model accurately predicts critical diameters for phase transitions.
Conclusions:
- 1-D nanostructure geometry significantly alters phase formation sequences.
- Size-dependent kinetics are crucial for predicting phase formation in nanoscale materials.
- The findings offer insights for designing nanoscale electronic devices.
