Graphene is a form of carbon. “Though we grow it from the vapor phase, this material is just like graphite in a pencil. You slide these right off the end of your pencil onto paper. If you were to place Scotch tape over it and pull up, you can sometimes pull up as small as one sheet of graphene. It is a little under 1 nanometer thick,” James Tour, Rice University professor, said.
Source: Lucas Mearian, Computerworld, December 18, 2008.