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Double-Walled Carbon Nanotubes in Composite Powders

Flahaut, Emmanuel and Peigney, Alain and Laurent, Christophe Double-Walled Carbon Nanotubes in Composite Powders. (2003) Journal of Nanoscience and Nanotechnology, 3 (1-2). 151-158. ISSN 1533-4880

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Official URL: http://dx.doi.org/10.1166/jnn.2003.177

Abstract

Double-walled carbon nanotubes (DWNTs) may be interesting in many applications since the outer wall would provide an interface with the rest of the system, without modifying the inner wall. CNT-Fe/Fe3C-Al2O3 composite powders containing carbon nanotubes (CNTs) (65% of which are DWNTs) are prepared by reduction of an oxide solid solution in a H2-CH4 gas mixture. The powders and CNTs are studied by both local and macroscopical techniques. The influence of the reducing atmosphere composition and of the dwell time at 1050°C is studied. There is a 6-fold increase in CNT content upon the increase in the CH4 content from 3 to 30 mol.%, but the formation of undesirable carbon nanofibers can also be promoted. A CH4 content of 12–18 mol.% is adapted for the particular iron content in these powders. Increasing the dwell time at 1050°C results in the formation of CNTs with more walls.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:23 Jun 2014 13:00

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