Figure 1. a) Upper panel: Schematic of a flexible graphene transistor array on a polyimide substrate. Lower panel: Microscope image of 36 transistors of the array with drain and source contacts and the SU8 window. Scale bar is 200 µm. b) Transistor currents of four transistors as a function of the applied gate potential measured in 5 mm PBS buffer. c) Normalized transconductance for the same transistors (W=20 µm; L=10 µm).
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