The most well known approach to making the carbon allotrope graphene, which is akin to single graphite sheets, was to peel pencil "lead" (graphite) from a glass surface using sticky tape. Making multilayer graphene flakes however was a little harder. Now, researchers from the Institute of Physical Chemistry of the Polish Academy of Sciences in Warsaw, and the Interdisciplinary Research Institute in Lille, France, have developed a low cost method for manufacturing multilayered graphene sheets. The team begins with graphene oxide and mixed it with tetrathiafulvalene in an ultrasonic cleaner to remove oxygen atoms from the graphene flakes through the formation of non-covalent pi-pi stacking interactions. Other than the sonicator, the approach needs no specialist equipment, nor sticky tape.
Ultrasonic flakes of graphene