Fig. 2
From: Green synthesis of graphene oxide by seconds timescale water electrolytic oxidation
Characterization of EGO. a-d, Comparison of EGO with HGO: aqueous solution (a, 1 mg·mL-1), XPS C1s spectra (b), FTIR spectra (c), Raman spectra (d). HGO was synthesized by a modified Hummers method7 using graphite flakes (80 mesh) as raw material. e–h, Typical AFM (e), SEM (f), TEM (g), and HRTEM (h) images of EGO sheets. i, j, Lateral size (i), and number of layers (j) distribution of EGO sheets obtained by sonication for 5 (black columns), 15 (red columns), and 30 min (blue columns). k, Mass produced EGO aqueous solution (5 mg·mL−1). Scale bars: e, 2 μm; f, 10 μm; g, 1 μm; h, 5 nm
