The field emission of vacuum filtered graphene films reduced by microwave

► Field emission of graphene film produced by microwave reduction is better. ► By examining the surface of graphene films by SEM and the detail of graphene by TEM, we conclude that larger size of microwave reduced graphene sheet can produce more natural rolls and tips by higher surface tension. It leads to the better field emission performance of microwave-reduced graphene film. ► The reduction level by microwave radiation is similar to reduced by hydrazine.