Graphene is a carbon material that is one atom thick. Its thin composition and high conductivity mean that it is used in applications ranging from miniaturized electronics to biomedical devices.
The term allotrope refers to one or more forms of a chemical element that occurs in the same physical state. The different forms arise from the different ways, atoms may be bonded together.
There are many allotropes of carbon.
These include diamond, graphite, graphene, carbon nanotubes, fullerenes, and carbon nanobuds.