Controllable selective exfoliation of high-quality graphene nanosheets   and nanodots by ionic liquid assisted grinding
  Bulk quantities of graphene nanosheets and nanodots have been selectively fabricated by mechanical grinding exfoliation of natural graphite in a small quantity of ionic liquids. The resulting graphene sheets and dots are solvent free with low levels of naturally absorbed oxygen, inherited from the starting graphite. The sheets are only two to five layers thick. The graphene nanodots have diameters in the range of 9-29 nm and heights in the range of 1-16 nm, which can be controlled by changing the processing time. 
Nai Gui Shang, Pagona Papakonstantinou, Surbhi Sharma, Gennady   Lubarsky, Meixian Li, David W. McNeill, Aidan J. Quinn, Wuz...
cond-mat.mtrl-sci