Exfoliated graphite nanoplatelets
Exfoliated graphite nano-platelets (xGnP) are new types of nanoparticles made from graphite. These nanoparticles consist of small stacks of graphene that are 1 to 15 nanometers thick, with diameters ranging from sub-micrometre to 100 micrometres.
Source: Wikipedia — Exfoliated graphite nanoplatelets (CC BY-SA 4.0)