Both cotton yarn (CY) and polyester yarn (PY) were used as templates for fabricating yarn wrapped with RGOs. Briefly, a dip-coating process was employed to coat an adhesive thin layer of BSA on the surface of both types of yarn. The resulting BSA-coated yarn (BSAY) was then wrapped with GO sheets through electrostatic self-assembly. Finally, graphene oxide yarn (GOY) was reduced using a low-temperature chemical reduction method. More details regarding the fabrication of RGOCY and RGOPY through a flow process can be found in our previous work, and are provided in the supporting information (Fig. S1)27. After chemical reduction, the color of the CY and PY changed from white to black. SEM images of RGOCY and RGOPY composed of single RGO microfibers with a diameter of 10 μm are shown in Fig. 2. The enlarged images (Fig. 2c,f) show numerous wrinkles and ripples around the individual fibers, which are attributed to the successful wrapping of the RGO sheets onto the CY and PY.
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