Article Dans Une Revue Journal of Nanoscience and Nanotechnology Année : 2003

Double-Walled Carbon Nanotubes in Composite Powders

Résumé

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.

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hal-04296553 , version 1 (20-11-2023)

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Emmanuel Flahaut, Alain Peigney, Christophe Laurent. Double-Walled Carbon Nanotubes in Composite Powders. Journal of Nanoscience and Nanotechnology, 2003, 3 (1-2), pp.151-158. ⟨10.1166/jnn.2003.177⟩. ⟨hal-04296553⟩
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