Fig. 19.32. Schematic array of carbon nanotubes with a common tubule axial direction in the (a) tetragonal [PA2/mmc (£>',,)], (b) hexagonal I [P6/mmm (Z)^)], and (c) hexagonal II [P6/mcc (£>|h)] space group arrangements. The reference nanotube is generated using a planar ring of 12 carbon atoms arranged in six pairs with the D6lt symmetry [19.10,11,106], ther work remains to be done addressing the role of the strain energy in determining relative alignments of multilayer nanotubes and arrays, and in examining the possibility of a Peierls distortion in removing the coaxial nesting of carbon nanotubes.

It has been shown [19.115] that the double-single bond pattern of the graphite lattice is possible only for several choices of chiral vectors. The corresponding energy gap depends on the chiral vectors and the diameters of the tubules.

From these results one could imagine designing a minimum-size conductive wire consisting of a double-layered concentric carbon nanotube with

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