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Stability of single-wall carbon nanotubes under hydrothermal conditions

Published online by Cambridge University Press:  31 January 2011

S. Srikanta Swamy
Affiliation:
Research Institute for Solvothermal Technology, 2217–43 Hayashi, Takamatsu, Kagawa, 761–0301, Japan
Jose Maria Calderon-Moreno
Affiliation:
Center for Materials Design, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagasuta, Midori-ku, Yokohama 2226–8503, Japan
Masahiro Yoshimura
Affiliation:
Center for Materials Design, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagasuta, Midori-ku, Yokohama 2226–8503, Japan
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Abstract

The stability of single-wall carbon nanotubes under hydrothermal conditions (100 MPa pressure, from 30 min to 48 h in the temperature range from 200 to 800 °C) has been investigated. The resultant products were characterized by Raman spectroscopy, x-ray diffraction, and transmission electron microscopy. The stability range of single-wall carbon nanotubes (SWCNTs) under hydrothermal conditions suggests that they, similar to fullerenes, can only survive mild and short-term treatment in high-temperature, high-pressure water. SWCNTs gradually transform into multiwall carbon nanotubes (MWCNTs) and polyhedral graphitic nanoparticules. After 48 h at 750 °C only the Raman spectra characteristic of graphitic carbon were observed. Transmission electron microscopy revealed that after 800 °C and 48 h of treatment SWCNTs fully transformed into MWCNTs and polyhedral carbon nanoparticles.

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Articles
Copyright
Copyright © Materials Research Society 2002

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