Figure 3 : Characterizations of the graphene film grown in an ambient-air environment.

From: Single-step ambient-air synthesis of graphene from renewable precursors as electrochemical genosensor

Figure 3

(a) A 4 × 2 cm2 graphene grown on Ni foil is transferred onto glass. Measurements were taken over four quadrants as labelled on the graphene surface. An optical micrograph of the graphene film transferred onto glass is also included. (b) Raman spectral analyses of the intensity ratios of ID/IG and I2D/IG. (c) Four-point probe and (d) optical transmission measurements of sheet resistance of graphene films in the respective regions. Scale bar, 20 μm in a.