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TEM pictures of tips of cone-shaped CNTs with different curvatures. (a) Sharp tip (radius of curvature ) and (b) dull tip (radius of curvature ).
Structure model of the tip of a cone-shaped CNT: (a) side view and (b) top view. Five pentagons are present at the apex of the cone.
(Color online) Two types of FEM patterns obtained from cone-shaped CNTs: (a) “dim” pattern and (b) “pentagon” pattern. Arrows show pentagon images.
(Color online) Histogram of tip radii of cone-shaped CNTs.
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