Double-walled armchair nanonube
(5,5)@(10,10)
Tripple-walled armchair nanonube
(4,4)@(9,9)@(14,14)
Nanotube bundle
2(5,5)+1(7,7)+1(6,6)
     
Armchair (5,5)
R=0.34nm
Zigzag (9,0)
R=0.35nm
Chiral (7,3)
R=0.35nm
     
Armchair (5,5)
R=0.34nm
Zigzag (9,0)
R=0.35nm
Chiral (7,3)
R=0.35nm