The structure of the GO hydrogel scaffolds. (a) Schematic illustration of the fabrication of the GO hydrogel scaffolds. (b) The generation of single-emulsion droplet templates. (c, d) The droplet templates orderly self-assemble into monolayer (c) and multilayer (d) packings. (e) Optical image of scaffolds. (f, g) SEM images of dehydrated scaffolds (top view and section view). The scale bar is 100 μm.