Graphene | What is graphene? | ExtremeTech | The word “graphene” is sometimes used interchangeably with the term “carbon nanotubes” or CNTs.
CNTs are exactly what they sound like: sheets of graphene that have been rolled up into a nano-scale tube. The walls of the tube are a single atom thick, but the tube overall is more stable and less reactive with other substances than regular, linear graphene.