Figure 1. Characterization of the GF structure.

(a) Photograph and (b) scanning electron micrograph of the microporous GF structure showing a continuous network of 3D interconnected graphene sheets that comprise the walls of the foam-like structure. The robust and flexible GF strips can be easily handled and manipulated. Electrical contacts to the macro-scale GF can be established without the need for lithography. (c) Typical Raman spectra obtained at various locations on the GF indicating that the foam walls are comprised of mono to few-layer graphene.