Write a detailed note on a nanotube.

I. Carbon nanotubes are allotropes of carbon such as fullerenes, having cylindrical nanostructure.

II. They are bucky balls with closing ends which form tube-like structures.

III. The carbon nanotube derived from a bucky ball is also called ‘bucky tube’.

IV. Nanotubes can be found with either closed-ends or open- ends.

V. Nanotubes with single cylinder called Single Walled Nanotube (SWNT).

VI. Nanotube with multiple concentric nano-cylinders are Multi-Walled Nanotube (MWNT).