Figure 1

Graphene fabrication is shown with (a) the mask pattern developed to fabricate the graphene electrodes along with the images captured by the complementary metal-oxide-semiconductor (CMOS) image sensor of the (b–i) eight electrode gaps with decreasing sizes of g = 500, 400, 300, 200, 180, 160, 140, and 120 μm, respectively, at the optimal number of doses through the optical disc drive (n = 5).