Structural and Electronic Properties of Low-Dimensional C-Nanoassemblies and Possible Analogues for Si (and Ge)
Figure 2
(a): Young modulus for armchair and zig-zag carbon and BN nanotubes. The values are given in the proper unit of TPa nm for SWNTs (left axis) and converted to TPa (right axis) by taking a value for the graphene thickness of 0.34 nm. The experimental values for carbon nanotubes are reported on the right-hand side: (a) 1.28 TPa [27]; (b) 1.25 TPa [28]; (c) 1 TPa for MWNTs [29]. (b): Young modulus versus tube diameter in different arrangements. Open symbols correspond to the multiwall geometry (10-layer tube with an interlayer distance of 0.34 nm), and solid symbols for the single-wall-nanotube crystalline-rope configuration. In the MWNT geometry, the value of the Young modulus does not depend on the specific number of layers. The experimental value of the 11 = 1.06 TPa elastic constant of graphite is also shown.