Fig. 2.
Scalable production of large-area highly aligned and compact GO films with different thickness. a, b A meter-scale ~10 μm-thick free-standing GO film (a) and thin GO film on polyethylene terephthalate (PET) (b) produced with a RHT of 33 cm in inner diameter. c A thin GO film on a 4 inch silicon wafer prepared with the same conditions as those for the production of the film in b. d, e Atomic force microscopy (AFM) image (d) of the film in c and the height profiles (e) along the three lines in d, showing the thickness of ~50 nm. Scale bars: b 10 cm; d 1 μm