A nanotube is a
|“||[h]ollow, cylindrical structures, with a diameter usually less than 5 nanometers. They are often but not necessarily, composed of carbon, and having remarkable strength and electrical properties.||”|
"Carbon nanotubes are nanoscale cylinders consisting of seamlessly 'rolled' sheets of graphene, a form of carbon. They are extraordinarily strong, flexible, lightweight, heat resistant, and have high electrical conductivity. Carbon nanotubes are currently used in a variety of applications including conductive coatings for touchscreens and solar cells, and sporting goods such as bicycle frames and baseball bats."