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A carbon nanotube (CNT) is a tube made of carbon with a diameter in the nanometre range (nanoscale). They are one of the allotropes of carbon. Two broad classes of carbon nanotubes are recognized:
* Single-walled carbon nanotubes (SWCNTs) have diameters around 0.5-2.0 nanometres, about a 100,000th the width of a human hair. They can be idealised as cutouts from a two-dimensional graphene

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