NDLI: Synthesis and characterization of carbon nanotubes grown on montmorillonite clay catalysts

Content Provider	Springer Nature Link
Author	Destrée, Alexandra Long, Gary J. Vatovez, Benjamin Grandjean, Fernande Fonseca, Antonio Nagy, Jas B. Fransolet, A. M.
Copyright Year	2007
Abstract	Multiwall carbon nanotubes have been grown on montmorillonite clay catalysts through anchoring on FeCo nanoparticles. The starting clay is a commercial sodium-rich montmorillonite in which the intercalated sodium ion was exchanged for cobalt(II) and iron(III) ions via mechanical agitation or sonication, both with and without subsequent centrifugation. The cobalt-iron intercalate clay was used as a catalyst for the synthesis of carbon nanotubes via decomposition of ethylene at 700 °C. The largest carbon deposit was obtained for catalysts prepared with 3 or 4 cation exchange equivalents. X-ray diffraction indicates both that the basal spacing of the clay increases from 12.43 Å to 16.4 Å upon intercalation of cobalt and iron. Atomic absorption analysis of the catalysts indicates that virtually all of the sodium ions originally present in the clay have been replaced by iron(III) and cobalt(II). Transmission electron micrographs show the presence of multiwall carbon nanotubes with inner and outer diameters of ca. 10 nm and 20 nm grown on metal particles present on the plates of catalysts. The iron-57 Mössbauer spectra indicate that the intercalated clay contains iron(III) in octahedral and tetrahedral sites and iron(II) in octahedral sites, the catalysts contain an extensive amount of small superparamagnetic particles of α-Fe$_{2}$O$_{3}$ and that the carbon-nanotube catalyst composites show the presence of iron(II) and iron(III) paramagnetic doublets, characteristic of a reduced montmorillonite, and of sextets that are characteristic of an FeCo alloy and of Fe$_{3}$C cementite. The Mössbauer spectra indicate that the carbon nanotubes grow on FeCo metallic nanoparticles and bond to these particles through the formation of cementite.
Starting Page	8671
Ending Page	8689
Page Count	19
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	42
Issue Number	20
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2007-07-19
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mechanics Crystallography Continuum Mechanics and Mechanics of Materials Polymer Sciences Characterization and Evaluation of Materials Materials Science
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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