Figure 2.

Characterization of mechanical and electrical properties of printed graphene electrodes. (A) Photos of a graphene electrode under cyclic bending. (B) Result of measured resistant change of the electrode in (A) with ten repetitive bending cycles up to 180 degrees. (C) Skin-electrode contact impedance on the wrist with different sizes of graphene electrodes and the comparison with a commercial gel electrode. Error bars indicate standard deviation from five trials (n = 5). (D) Measured GSR data from the wrist using the biggest graphene electrode (area = 4 cm²) in (C).