Figure 13: a) Nyquist impedimetric plot of Z " versus Z ' for a redox active, CRP-receptive film, where only minimal sensitivity to target binding is evident. The analogous capacitive response to CRP binding is shown in b) where a sensitive modulation in response to CRP is observed (Cr itself is obtained from the semicircle diameters). All plots are average curves obtained from three different working electrodes. Reproduced with permission from reference [102].