HI, there are many companies which sell high quality CVD graphene over large area. One can get easily 10x10 cm2 monolayer graphene on copper foil. I think its sufficient enough to make devices on 4 inch wafer. This status may improve in next 1 or 2 years.
CNTs has already been incorporated to membrane modules and are being tested in pilot scale plants. Orientation and spatial arrangement of CNTs still remains a challenge.