Thermal CVD Growth of Carbon Nanotubes Thick Layers |
| Journal |
Advances in Science and Technology (Volume 48) |
| Volume |
Diamond and Other New Carbon Materials IV |
| Edited by |
P. VINCENZINI and E. CAPPELLI |
| Pages |
37-43 |
| DOI |
10.4028/www.scientific.net/AST.48.37 |
| Online since |
October, 2006 |
| Authors |
Samuele Porro,
Simone Musso,
Mauro Giorcelli,
Alberto Tagliaferro
|
| Keywords |
BET, Carbon Nanotube (CNT), Electron Microscopy, Hydrophobicity, TGA, Thermal CVD |
| Abstract |
Since their discovery, carbon nanotubes received a great deal of attention because of
unique physical and chemical properties. However, in order to become of interest in the field of
super resistant fibers for nanocomposite materials or in the production of textile material, very long
carbon nanotubes are needed. Massive samples of well packed, vertically aligned and very long selfstanding
multi wall carbon nanotubes (MWNT) were synthesized on uncoated silicon by a very
efficient thermal CVD process, which involved the co-evaporation of camphor and ferrocene in a
nitrogen atmosphere. We obtained structures with diameter between 20 and 80 nm with an average
growth rate of about 400 nm/s, organized in thick carpets of entangled nanotubes. By the weight of
the deposited carpet of MWNTs (density circa 0.8 g/cm3) the conversion of about 30% of the total
hydrocarbon feedstock was calculated.
Morphology and physical properties were characterized by electron microscopy techniques, Micro-
Raman spectroscopy and thermogravimetric analysis. The analyses performed showed the absence
of secondary carbonaceous products, whereas only 6% in weight of ferromagnetic iron clusters are
present. BET analysis was used to calculate the porosity and the specific surface area density of the
as grown samples, which resulted approximately 70 m2/g. Hydrophobicity of the CNT carpet was
also investigated. |
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