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The Effects of Crystallinity and Catalyst Dynamics on Boron Carbide Nanospring Formation

Published online by Cambridge University Press:  11 February 2011

D. N. McIlroy ,
D. Zhang ,
Y. Kranov ,
H. Han ,
A. Alkhateeb  and
M. Grant Norton
D. N. McIlroy
Affiliation:
Department of Physics, Engineering and Physics Bldg., University of Idaho, Moscow, ID, 83844–0903, U.S.A.
D. Zhang
Affiliation:
Department of Physics, Engineering and Physics Bldg., University of Idaho, Moscow, ID, 83844–0903, U.S.A.
Y. Kranov
Affiliation:
Department of Physics, Engineering and Physics Bldg., University of Idaho, Moscow, ID, 83844–0903, U.S.A.
H. Han
Affiliation:
Department of Physics, Engineering and Physics Bldg., University of Idaho, Moscow, ID, 83844–0903, U.S.A.
A. Alkhateeb
Affiliation:
Department of Physics, Engineering and Physics Bldg., University of Idaho, Moscow, ID, 83844–0903, U.S.A.
M. Grant Norton
Affiliation:
School of Mechanical and Materials Engineering, Washington State University, Pullman, WA 99164–2920, U.S.A.
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Abstract

The formation of helical nanowires—nanosprings—of boron carbide have been observed and a growth mechanism, based on the work of adhesion of the metal catalyst and the tip of the nanowire, developed. The model demonstrates that the asymmetry necessary for helical growth is introduced when the following conditions are met:

(1) The radius of the droplet is larger than the radius of the nanowire, and

(2) The center of mass of the metal droplet is displaced laterally from the central axis of the nanowire.

Furthermore, this model indicates that only amorphous nanowires will exhibit this unique form of growth and that in monocrystalline nanowires it is the crystal structure that inhibits helical growth. High-resolution transmission electron microscopy and electron diffraction has been used to compare the structure of both amorphous and crystalline nanowires.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 739: Symposium H – Three-Dimensional Nanoengineered Assemblies , 2002 , H5.2
Copyright
Copyright © Materials Research Society 2003

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References

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