Aligned Carbon Nanotube Bundles

Satishkumar BC, Govindaraj A, Vanitha PV, Raychaudhuri AK, Rao CNR. Barkhausen jumps and related magnetic properties of iron nanowires encapsulated in aligned carbon nanotube bundles. Chem Phys Lett 2002 362 301-6. 

Satishkumar. B. C. Govindaraj, A. Rao. C. N. R. Bundles of aligned carbon nanotubes obtained by the pyrolysis of ferrocene-hydrocarbon mixtures role of the metal nanoparticies produced in situ, Chem. Phys. Lett. 1999 307. 158. 

M.F. Lin, F.L. Shyu, R.B. Chen, Optical properties of well-aligned multiwalled carbon nanotube bundles. Phys. Rev. B 61, 14114 (2000)... 

FIGURE 11. (a, b) TEM images of the iron nanorods encapsulated inside the carbon nanotubes from aligned nanotube bundles, (c) HREM image of a single-crystal iron nanorod encapsulated inside a carbon nanotube. The inset in (c) represents the selected area electron diffraction (SAED) pattern of a iron nanorod.11239... 

Aligned multiwall CNT arrays were synthesized as a basis for a microstructured catalyst, which was then tested in the Fischer-Tropsch reaction in a microchannel reactor [269]. Fabrication of such a structured catalyst first involved MOCVD of a thin but dense A1203 film on a FeCrAlY foam to enhance the adhesion between the catalyst and the metal substrate. Then, multiwall CNTs were deposited uniformly on the substrate by controlled catalytic decomposition of ethene. Coating the outer surfaces of the nanotube bundles with an active catalyst layer results in a unique hierarchical structure with small interstitial spaces between the carbon bundles. The microstructured catalyst was characterized by the excellent thermal conductivity inherent to CNTs, and heat could be efficiently removed from the catalytically active sites during the exothermic Fischer-Tropsch synthesis. 

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