Nanotube aligned bundles

Rao. C. N. R. Govindaraj, A. Sen, R. Satishkumar. B. C. Synthesis of multiwalled and single-walled nanotubes, aligned bundles and nanorods by employing organometallic precursors. Mater. Res. Innovations 1998 2. 128. 

FIGURE 13. (a, b) SEM images of BN nanotubes obtained by heating aligned bundles of MWNTs with boric acid in the presence of ammonia at 1300 °C. (c) TEM image of the BN nanotubes obtained by tlie same procedure as in (a) and (b).41... 

A slight variation in these parameters causes a shift from a metallic state to a semiconducting state. Regardless of the synthesis method, microscopic smdies have revealed that samples consist of bundles of 20 to 100 individual nanotubes aligned in a two-dimensional crystal-packing arrangement over essentially their entire length [37,38]. The bundles, also... 

Work on the production and oxidation of SWNT samples at SRI and other laboratories has led to the observation of very long bundles of these tubes, as can be seen in Fig. 2. In the cleanup and removal of the amorphous carbon in the original sample, the SWNTs self-assemble into aligned cable structures due to van der Waals forces. These structures are akin to the SW nanotube crystals discussed by Tersoff and Ruoff they show that van der Waals forces can flatten tubes of diameter larger than 2.5 nm into a hexagonal cross-sectional lattice or honeycomb structure[17]. 

Fig. 18 SEM images of aligned-nanotube bundles obtained by the pyrolysis of ferrocene (from Rao et al. " ).

FIGURE 6. SEM images showing the bundles of aligned nanotubes obtained by the pyrolysis of ferrocene along with (a) methane, (b) acetylene, and (c) butane (hydrocarbon at 50 seem) at 1100 °C in a At flow of 950 seem.15... 

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... 

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