Fig. 2: Oriented and compact stacking of planar graphene in the assembled fiber.
From: Covalently bridging graphene edges for improving mechanical and electrical properties of fibers
a Schematic of the process to assemble GO sheets into a macroscopic fiber with belt-type morphology with highly oriented and ordered stacking structure by selective edge linkage. For comparison, the disordered assembly of GO sheets into a fiber with the usually observed circular cross-section is also illustrated, which replicates the needle geometry due to absence of constraint. Typical cross-sectional SEM images of (b) fiber with amide bridges and (c) the control fiber. Representative HR-TEM images for (d) a cross-sectional slice and (e) a transverse-sectional slice of our amide-connected fiber. f Two-dimensional WAXS diffraction pattern of graphene fibers. The equatorial and meridional scattering directions are indicated by cyan and bronze arrows. Color bar refer to the intensity in arbitrary units. g The corresponding one-dimensional scattering profile by integrating equatorial and meridional axes of (f, h) azimuthal scan integral curve for the (002) peak.
