Figure 2
From: Facile Access to Graphene Oxide from Ferro-Induced Oxidation

The resultant GO before and after purification.
(A,B) TEM observation of as-prepared GO without purification (sample 1, (A)) and after purification (sample 2, (B)). (C,D) AFM images and corresponding height profiles of the surface of sample 1 (C) and sample 2 (D). The 3D contour images are shown below.