By M. Endo, S. Iijima, M.S. Dresselhaus
Carbon nanotubes were studied broadly with regards to fullerenes, and including fullerenes have opened a brand new technology and know-how box on nano scale fabrics. an entire diversity of matters from the training, constitution, homes and statement of quantum results in carbon nanotubes compared to 0-D fullerenes are mentioned. moreover, complementary experiences on carbon nanoparticles akin to carbon nano-capsules, onion-like graphite debris and metal-coated fullerenes are coated. This booklet goals to hide contemporary examine and improvement during this quarter, and so offer a handy reference software for all researchers during this box. it's also was hoping that this publication can serve to stimulate destiny paintings on carbon nanotubes.
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Extra resources for Carbon Nanotubes
Even though the geometry was chosen to give rise to the most commensurate interlayer stacking, the energy dispersion relations are only weakly perturbed by the interlayer interaction. More specifically, the calculated energy band structure showed that two coaxial zigzag nanotubes that would each be metallic as single-wall nanotubes yield a metallic double-wall nanotube when a weak interlayer coupling between the concentric nanotubes is introduced. Similarly, two coaxial semiconducting tubules remain semiconducting when the weak interlayer coupling is introduced[l5].
4 Gas$cation of nanotubes The carbon deposited catalysts were treated both by oxidation and hydrogenation at temperatures in the range of 873-1173 K for various exposure times. Some results of oxidation treatment are presented in . , 0 PPM , , l -50 , , , , l , l -100 Fig. 10. ‘H NMR spectra: (a) coronene; (b) Co-SiO, covered by carbon nanotubules; (c) Co-SiO, covered by carbon nanotubules and evacuated to torr for the NMR measurement; (d) Co-SiO, torr for the NMR measurement. evacuated to 24 V.
13) ~ 2 . 2 wt%. 6 natures. The most interesting ones are regular defects leading to the formation of helices. The helical tubules are 6-10% of the total amount of filaments as estimated from the microscopy observations (Fig. 9(b)). The mechanism of helices formation was discussed elsewhereC271 and a model based on the regular introduction of pentagon-heptagon pairs was proposed. The presence of stress causes the formation of “kinks” in the graphite layers. This kind of defect was also well describedC211.