Questions on formation 1.If the smallest diameter single-walled carbon nanotube is 0.4nm (N. Wang, et al., Nature 408, (2000)) for a zig-zag configuration, what is n and m? 2.What prevents this value from being smaller? 3.Is this carbon nanotube metallic? 4.What changes to a single sheet of graphite will cause enclosure to form a C 60 molecule? Which ones are needed to form a spiral nanotube?
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