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Summary: Direct Synthesis of Long
Single-Walled Carbon Nanotube
Strands
H. W. Zhu,1
C. L. Xu,1
D. H. Wu,1
* B. Q. Wei,2
R. Vajtai,2
P. M. Ajayan2
*
In the processes that are used to produce single-walled nanotubes (electric arc,
laser ablation, and chemical vapor deposition), the typical lengths of tangled
nanotube bundles reach several tens of micrometers. We report that long
nanotube strands, up to several centimeters in length, consisting of aligned
single-walled nanotubes can be synthesized by the catalytic pyrolysis of n-
hexane with an enhanced vertical floating technique. The long strands of
nanotubes assemble continuously from arrays of nanotubes, which are intrin-
sically long.
There has been much interest in the produc-
tion and processing of carbon nanotubes
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