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Science 3 May 2002:
Vol. 296. no. 5569, pp. 884 - 886
DOI: 10.1126/science.1066996
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Reports

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 intrinsically long.

1 Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
2 Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.
*   To whom correspondence should be addressed. E-mail: wdh-dme{at}tsinghua.edu.cn, ajayan{at}rpi.edu

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