FIGURE 3.
Electrochemical characterization of electrode interfaces during the multistep biosensor build-up. (A) Cyclic voltammograms and (B) Nyquist’s Plot recorded in 0.010 M [Fe(CN)6]4−/3− in 0.05 M PBS (IL-6 50 pg/mL). Curves of one representative immunosensor of at least 3 analysed SPEs are presented. Randles model for the equivalent circuit (solution resistance (Rs), charge transfer resistance (Rct), the capacitance of double layer (CPE), and Warburg impedance (W)) is reported as inset in panel (B) (Barsoukov, 2018).