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Carbon nanotubes are basically divided into two classes: single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes (MWCNTs). Both have very different physical properties due to their structural differences.

The most important feature of SWCNTs is that the wall of the nanotubes consists of a single layer of graphene. In other words, single-walled carbon nanotubes can be described as sheets of graphene rolled into hollow cylinders.

A multi-walled carbon nanotube can be viewed as a concentric array of SWCNTs, i.e. multiple layers of graphene rolled into a tubular shape.

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