Nitrogendoped graphene by ballmilling graphite with ...
graphite and melamine in a planetary ballmill machine (Pulverisette 6, Fritsch). In a typical experiment, 1g of the graphite and 10g of melamine were put into a stainless steel grinding bowl (80mL) containing 200 stainless steel grinding ball (5mm). The bowl was sealed followed by fixing it in the planetary ballmill machine. The mixture was ...