Types of Carbon Nanotubes
A diagram showing the types of carbon nanotubes. (Created by Michael Ströck (mstroeck) on February 1, 2006. Released under the GFDL). The (n,m) nanotube naming scheme can be thought of as a vector (Ch) in an infinite graphene sheet that describes how to 'roll up' the graphene sheet to make the nanotube. T denotes the tube axis, and a1 and a2 are the unit vectors of graphene in real space. If m=0, the nanotubes are called zigzag. If n=m, the nanotubes are called armchair. Otherwise, they are called chiral.
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