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(Mg,Co)O Solid‐Solution Precursors for the Large‐Scale Synthesis of Carbon Nanotubes by Catalytic Chemical Vapor Deposition
Author(s) -
Bacsa Revathi R.,
Laurent Christophe,
Peigney Alain,
Vaugien Thibaud,
Flahaut Emmanuel,
Bacsa Wolfgang S.,
Rousset Abel
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00513.x
Subject(s) - carbon nanotube , methane , chemical vapor deposition , catalysis , stoichiometry , chemical engineering , combustion , oxide , carbon fibers , materials science , raman spectroscopy , hydrogen , bet theory , inorganic chemistry , chemistry , nanotechnology , organic chemistry , composite number , physics , optics , engineering , metallurgy , composite material
Single‐ and double‐walled carbon nanotubes were produced in high yield using the selective reduction of solid solutions of Mg 1– x Co x O in a methane and hydrogen atmosphere at 1000°C. The solid solutions were prepared using combustion synthesis with urea as the fuel. The BET surface areas ranged from 10 to 65 m 2 /g depending on the fuel content. A single crystalline phase was obtained only for fuel‐rich compositions. Increased fuel content increased the surface area by a factor of 6. However, very high fuel contents (>4 times the stoichiometric amount) caused a demixed solid solution. Surface‐area measurements and Raman spectra showed that the quantity of nanotubes formed depended on the surface area and composition of the precursor oxide.