Figure 2. Flexibility, mechanical and electrical properties of graphene fibers.

SEM images of (a) the end of the twisted fiber; (b) the middle of the twisted fiber; (c) the end of the folded fiber. (d) Typical strain-stress curves of the single GO and graphene fiber. The inset photograph showing the testing state of the single fiber. (e) Typical I-V curve of the single graphene fiber with the length of 13.5 cm. The inset shows the lighted LED lamp using the prepared graphene fiber as the leads.