Fig. 2: Characterization of AD-rGO flakes.
From: Quasi-vertically asymmetric channels of graphene oxide membrane for ultrafast ion sieving
a Atomic force microscope (AFM) image of AD-rGO flakes with corresponding height profiles taken along the marked white line. b Size distribution of AD-rGO and initial GO flakes measured by nanoparticle size analyzer. c C1s X-ray photoelectron spectrum of AD-rGO flakes. d C1s X-ray photoelectron spectrum of initial GO flakes. The spectrum is decomposed into five peaks, which correspond to the C-C/C = C (sp2 carbon), C-N, C-O-C/C-OH, C = O, and O = C-OH groups.
