Preparation of Colloidal Dispersions of Graphene Sheets in Organic Solvents by Using Ball Milling
Figure 4
Supernatant graphene sheets in DMF. (a) AFM image of the supernatant graphene deposited on a mica substrate, followed with the corresponding height cross-section along the line in the image; the height difference between red arrows is ~1.8 nm. (b, c) HRTEM image of separated graphene sheets embedded in polymer slice (b) and isolated flat graphene flakes solution-dropped on TEM grid, from which scrolled edges were observed (c). (d) SEM images of restacked graphene sheets forming a paper-like layered structure.
