Nanotube
Nanotubes are cylindrical nanostructures with diameters on the order of a few nanometers and lengths that can extend to micrometers. The term most often refers to carbon nanotubes, which are formed from rolled graphene sheets. Carbon nanotubes are categorized as single-walled (SWCNTs) or multi-walled (MWCNTs) depending on whether a single graphene cylinder or multiple concentric cylinders are present. Other materials can form nanotube-like structures, but CNTs remain the most extensively studied.
Key properties of carbon nanotubes include exceptionally high tensile strength and stiffness, an extremely high aspect
Synthesis and structure: CNTs are typically produced by arc discharge, laser ablation, or chemical vapor deposition.
Applications: CNTs are used to reinforce polymers and ceramics, in nanoelectronic components, conductive films, and energy
History: Carbon nanotubes were discovered in 1991 by Sumio Iijima. Since then, they have been the subject