Jeehwan Kim has a PNAS paper in which he confirms that a technique he previously developed does indeed create single domain graphene, meaning graphene that uniformly conducts electrons. Currently, the conventional way to make graphene involves chemical vapor deposition, which causes graphene to have a very rough, irregular surface that blocks electrons from flowing at uniform rates. He’s developed a way to peel off semi-flat sheets of graphene from silicon carbide, instead of using CVD, and also a way to iron out the very small kinks in graphene. He found the conductivity throughout the graphene wafer was uniform. This, he says, is a significant step towards making graphene a viable and cheap alternative to semiconductor materials like silicon.