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The structure of a graphene sheet is shown in Figure 5.17.
Figure 5.17 Geometry of a graphene sheet using a coordinate system based on the unit vectors ~e1 and ~e21 .
The system of coordinates of a graphene sheet is redisplayed in Figure 5.18, where the chirality vector of the nanotube (4,1) and the tube axis of the correspond- ing nanotube are indicated.
After rolling the graphene sheet to form a tube, a �10; 10� nanotube with a diameter of 1.35 nm has the appearance depicted in Figure 5.19.
Figure 5.18 Graphene sheet showing the chirality vector (4,1) in red.
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