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Doped multi-walled carbon nanotubes: synthesis, structure and properties. (South Carolina Academy of Sciences Abstracts).

We have previously shown that high purity multiwalled carbon nanotubes (pristine MWNTs) can be prepared from a mixture of xylene-ferrocene (99 a%C: 1 at% Fe) inside a quartz tube reactor operating at ~700[degrees]C. In a similar process, ~3 grams of melamine ([C.sub.3][H.sub.6][N.sub.6]) were introduced during the growth of MWNTs to prepare nitrogen-doped nanotubes. The structural and electronic properties of nitrogen-doped MWNTs were determined using scanning electron microscopy, high-resolution transmission electron microscopy (HRTEM), electron energy loss spectroscopy (EELS) and thermopower measurements. Individual nitrogen-doped nanotube exhibits a bamboo-like structure and comprises of 6-16 tube walls as evidence by HRTEM studies. The EELS measurements yielded an average nitrogen content of ~5 at% in the doped tubes. The thermoelectric power data of nitrogendoped MWNTs remained negative even after exposure to oxygen for an extended period of time suggesting that nitrogen doping of MWNTs renders them n-type, consistent with scanning tunnelling speetroscopic studies on similar nanotubes.
B. Sadanadan, T. Savage, A.M. Rao
Department of Physics and Astronomy, Clemson University
Alan Cassell, M. Meyyappan, NASA Ames Research Center,
Moffett Field, CA Z.R. Dai, Department of Materials Science
and Engineering Georgia Institute of Technology
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Title Annotation:chemical research
Author:Sadanadan, B.; Savage, T.; Rao, A.M.; Cassell, Alan; Meyyappan, M.; Dai, Z.R.
Publication:Bulletin of the South Carolina Academy of Science
Article Type:Brief Article
Date:Jan 1, 2003
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Next Article:Photoinduced oxidation of carbon nanotubes. (South Carolina Academy of Sciences Abstracts).

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