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tance ∼
0.14 nm ). The layers themselves are rather weakly bound to each other (weak
long range Van der Waals type interaction, interlayer distance of ∼ 0.34 nm).
The weak interlayer coupling gives graphite the property of a seemingly very
soft material. The property us to use allows to use graphite in a pencil.
Carbon Nanotubes are considered to be a curved graphene sheet.
Graphene sheets are seamless cylinders derived from a honeycomb lattice,
representing a single atomic layer of crystalline graphite. The structure of a
Single-Wall Carbon Nanotube (SWCT) is expressed in terms of one-dimensional
unit cell, defined by the vector where a1 and a2 are unit vectors, and n and m
are integers. A nanotube constructed in this way is called an (n,m) nanotube.
Rolling up the sheet along one of the symmetry axis gives either a zig-zag
(m=0) tube or an armchair (n=m) tube. It is also possible to roll up the sheet
in a direction that differs from a symmetry axis to obtain a chiral nanotube. As
a well as the chiral angle, the circumference of the cylinder can also be varied.
source : http://phycomp.technion.ac.il/~talimu/structure.html http://100.naver.com/100.nhn?docid=769050

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