High-quality multiwalled carbon nanotubes from catalytic decomposition of carboneous materials in gas-solid fluidized beds

The effects of reaction temperature (873-1223 K), carbon sources (CH4, C2H2, C2H4, and C2H6), and the amount of catalyst (2.5-20 g) on the physical properties (tube diameter, conversion, volume expansion, intensity ratio of the D- and G-band peaks (I-D/I-G)) of multiwalled carbon nanotubes (MWCNTs) in a gas-solid fluidized bed reactor (with an inner diameter (id) of 0.056 in and a height of 1.0 m) have been determined. The MWCNTs synthesized by the catalytic decomposition of methane produce the smallest tube diameter and the highest intensity ratio (I-D/I-G) among the carbon sources (acetylene, ethylene, and ethane). Although the tube diameter of MWCNTs that have been synthesized from the decomposition of methane and ethane at 1073 K are similar, the volume expansion of the carbon nanotubes (CNTs) agglomerate from ethane is higher than that from methane. Both the tube diameter and the ID/IG ratio of the MWCNTs synthesized from the decomposition of methane decrease as the reaction temperature increases (in the temperature range of 1073-1223 K). The amount of catalyst does not affect the mean tube diameter of the synthesized CNTs; however, CNTs with a bamboo structure are synthesized when the carbon decomposition rate is higher than the CNT growth rate.
Publisher
Amer Chemical Soc
Issue Date
2008-04
Language
ENG
Keywords

CHEMICAL-VAPOR-DEPOSITION; LARGE-SCALE PRODUCTION; DIAMETER CONTROL; METHANE DECOMPOSITION; GROWTH-MECHANISM; REACTOR; CVD; CO; NANOPARTICLES; FABRICATION

Citation

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, v.47, no.7, pp.2166 - 2175

ISSN
0888-5885
DOI
10.1021/ie0711630
URI
http://hdl.handle.net/10203/87765
Appears in Collection
CBE-Journal Papers(저널논문)
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