Researchers from Korea's Ulsan National Institute of Science and Technology (UNIST) developed a simple and low-cost way to dope graphene nanoplatelets (GNPs) with Nitrogen. These new materials may prove useful for dye-sensitized solar cells and fuel cells.

The researchers used dry ball-milling and they say that this is an efficient way to chemically modify the graphene flakes. This is more useful than current ways (most commonly the Harber-Bosch process, which requires extreme pressure and temperature conditions).