Fig. 1: Structural characteristics of GFs.
From: Bidirectional mid-infrared communications between two identical macroscopic graphene fibres
a Photograph of meters-long GF collected on a graphite roller. b, c SEM images of the GF surface at different magnifications. d Weaving continuous GFs into a cotton cloth and wearing the composite fabric on a finger. e, f SEM images of GF cross-section showing randomly stacked graphene sheets. g TEM image of a crystallized graphene sheet in GF. h XRD spectrum of GF. The full width at half maximum (W1/2) of ~0.272° indicates restoration of ~29.7 nm thick graphene crystals in GF as described by Scherrer equation (LC = 0.9λ/(W1/2 cosθ)). i Four-point electrical conductivity of GF as a function of inverse temperature. j Mechanical durability test of GF up to 100 cycles.
