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(a) Schematic of protein binding and unbinding to an antibody-modified SiNW FET sensor. S and D correspond to the source and drain metal contacts to the NW. (b) A schematic of electrical noise in a time-domain measurement. (c) Schematic of Lorentzian and 1/f functions in the frequency domain. (d) Models of a two-level system (left) and an RC circuit (right).
