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Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

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Core-shell formation in self-induced InAlN nanorods.

J Palisaitis¹, C-L Hsiao¹, L Hultman¹

¹Thin Film Physics Division, Department of Physics, Chemistry, and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden.

|February 10, 2017

Summary

This study reveals how indium aluminum nitride (InAlN) core-shell nanorods form. Early InAlN deposition leads to phase separation, forming In-enriched cores and Al-rich shells, crucial for nanorod growth.

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Area of Science:

Materials Science
Nanotechnology
Solid State Physics

Background:

Indium aluminum nitride (InAlN) is a tunable alloy with applications in optoelectronics and high-frequency devices.
Understanding the initial stages of nanostructure formation is critical for controlling material properties.

Purpose of the Study:

To investigate the early-stage self-induced formation mechanisms of InAlN core-shell nanorods (NRs).
To elucidate the role of phase separation in the initial growth of InAlN nanostructures.

Main Methods:

Transmission electron microscopy (TEM) in plan-view geometry.
Dual magnetron sputter epitaxy for InAlN deposition.

Main Results:

InAlN phase separates into Al-rich and In-enriched islands during initial deposition.
In-enriched islands coalesce and transform into hexagonal NR cores.
Al-rich InAlN forms a shell around the In-enriched cores.
Growth progresses to axial and radial expansion, eventually dominated by axial NR growth.

Conclusions:

The formation of InAlN core-shell NRs is driven by initial alloy phase separation.
Adatom surface kinetics, island surface energy, and deposition flux influence the growth mechanism.
The study provides insights into controlling InAlN nanorod morphology and properties.