Production appears to be what they are improving here: > But it has been difficult to produce large quantities of single-layer graphene using existing methods,

Production appears to be what they are improving here: > But it has been difficult to produce large quantities of single-layer graphene using existing methods, such as chemical vapour deposition (CVD). Current production routes are also quite costly. > On the other hand, said Dr Nair, "graphene oxide can be produced by simple oxidation in the lab". > "In terms of scalability and the cost of the material, graphene oxide has a potential advantage over single-layered graphene."