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Structural Characterization of GaN Nanowires Fabricated via Direct Reaction of Ga Vapor and Ammonia

Published online by Cambridge University Press:  21 March 2011

R.N. Jacobs ,
L. Salamanca-Riba ,
M. He ,
G.L. Harris ,
P. Zhou ,
S. N. Mohammad  and
J.B. Halpern
R.N. Jacobs
Affiliation:
Dept. of Materials & Nuclear Engineering, University of Maryland, College Park, MD 20742
L. Salamanca-Riba
Affiliation:
Dept. of Materials & Nuclear Engineering, University of Maryland, College Park, MD 20742
M. He
Affiliation:
Materials Science Research Center of Excellence Howard University, Washington, DC 20059
G.L. Harris
Affiliation:
Materials Science Research Center of Excellence Howard University, Washington, DC 20059
P. Zhou
Affiliation:
Materials Science Research Center of Excellence Howard University, Washington, DC 20059
S. N. Mohammad
Affiliation:
Materials Science Research Center of Excellence Howard University, Washington, DC 20059
J.B. Halpern
Affiliation:
Materials Science Research Center of Excellence Howard University, Washington, DC 20059
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Abstract

We report structural studies of large-scale wurtzite GaN nanowires fabricated by direct reaction of Ga vapor and NH3. This recently reported growth technique [1] demonstrates processing of GaN one-dimensional structures as thin as 26 nm and up to 500 μm in length. This method is both interesting and attractive in that fabrication is carried out without the assistance of template materials as required by other methods. In this study, transmission electron microscopy (TEM) is used to characterize the nanowires, while x-ray diffraction (XRD) and energy dispersive x-ray spectroscopy (EDS) data provide supporting structural/compositional analysis. Our structural investigation reveals the presence of thin hexagonal platelets, which we believe play a critical role in the nucleation, growth, and orientation of the wires. In particular, our findings indicate that most of the wires grow along the [2110] direction, normal to the platelet edges.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 675: Symposium W – Nanotubes, Fullerenes, Nanostructured and Disordered Carbon , 2001 , W9.4.1
Copyright
Copyright © Materials Research Society 2001

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References

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