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(a) The schematic illustration of liquid gated graphene FET (GFET) for blue light detection. (b) Transfer curves of GFET before (red) and after modification (black). Bias voltage is 0.01 V. (c) Photocurrent responses of the modified GFET at different gate voltages. Illumination began at t=30 s and end at t=80 s. (d) Photocurrent responses of graphene detectors functionalized with various BLUF mutants.
