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Direct Observation of Intercalant and Catalyst Particle in Single Wall Carbon Nanotubes

Published online by Cambridge University Press:  10 February 2011

X. Fan ,
E. C. Dickey ,
P. Eklund ,
K. Williams ,
L. Grigorian ,
A Puretzky ,
D. Geohegan ,
R. Buczko ,
S. T. Pantelides  and
S. J. Pennycook
X. Fan
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831 Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY, 40506
E. C. Dickey
Affiliation:
Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY, 40506
P. Eklund
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, KY, 40506
K. Williams
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, KY, 40506
L. Grigorian
Affiliation:
Department of Physics and Astronomy, University of Kentucky, Lexington, KY, 40506
A Puretzky
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831
D. Geohegan
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831
R. Buczko
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831 Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235
S. T. Pantelides
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831 Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235
S. J. Pennycook
Affiliation:
Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831 Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235
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Abstract

The Z-contrast scanning transmission electron microscopy (STEM) imaging technique has been used to study dopant atoms and catalyst particles in single wall carbon nanotubes (SWNT). Iodine and bromine have been doped respectively in arc-grown SWNTs. We have directly observed the dopant sites and distributions. Both dopants appear to be incorporated linearly within the SWNT bundles. SWNT were also grown by pulsed laser ablation with mixed Ni and Co catalyst, and the size and distribution of catalytic particles was studied. By using Z-contrast imaging, we found that the size distribution of the catalyst particles varied over a large range, but even the smallest were larger than the diameter of an individual SWNT. Furthermore, electron energy loss spectroscopy (EELS) is used to determine the composition of individual nanocatalyst particles, and were found to consist of a uniform alloy of Co and Ni.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 593: Symposium U – Amorphous & Nanostructured Carbon , 1999 , 129
Copyright
Copyright © Materials Research Society 2000

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References

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