Figure 3. a) Fluorescence image of HL-1 cells on a flexible graphene SGFET. Scale bar is 60 µm. b) Current of several graphene transistors showing action potential recordings of HL-1 cells. c) Zoom into a single action potential from b). d) Calculated change in the effective gate potential of a transistor from c) for a single recording (blue) and averaging 47 action potentials (orange).
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