Fig. 1: Assembly and structural characterization of the heterogeneous multilayered am-GO membrane. | npj 2D Materials and Applications

Fig. 1: Assembly and structural characterization of the heterogeneous multilayered am-GO membrane.

From: Tunable anion transport and the chemical transistor effect in functionalized graphene oxide membranes

Fig. 1

a Ionization of GO, PEI, and am-GO dispersion as a function of pH, indicating maximum protonation of nanolayers at pH 2. b Photograph and cross-sectional scanning electron microscopy (SEM) image of the lamellar am-GO membrane. c X-ray photoelectron spectra (XPS) of C1s, N1s, and O1s peaks for the am-GO membrane prepared at pH 2. d X-ray diffraction (XRD) patterns showing interlayer distances in GO and am-GO membranes in dry and hydrated states. e Structural configurations of dry and wet am-GO membranes predicted by density functional theory (DFT) computations. In the hydrated state, the most stable configuration features a 7.5 Å aqueous transport channel formed between the PEI-functionalized GO surface and the upper GO sheet.

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