Figure 1
From: Cone-like graphene nanostructures: electronic and optical properties
Geometry elements. (Color online) Pictorial view of (a) a carbon disk composed of six wedge sections of angle π/3, then (b) the removal of a wedge sections from the disk, and (c) by folding, it is constructed as a cone. Geometrical elements: generatrix r D , height h c , base radius r c , and apex opening angle 2θ, where sinθ=1−n w /6.