You already added duct tape. You actually can obtain graphene using duct tape and graphite and this was the first method used by people that discovered graphene and won nobel prize as well.
A more proper way to create graphene is using shear mixer and ultrasound.
Anyway in both cases you can obtain graphene sheets up to few microns^2 at most, so, if you want to take account of realism, you should consider that as well.
I think carbon fiber would make much more sense.