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Fig. 2. (A) CV of 1 mM [Fe (CN)6]3−/4− in 0.1 M KCl at 50 mV s−1 scan rate. (B) EIS of 1 mM [Fe(CN)6]3−/4− in 0.1 M KCl. For both CV and EIS: where labels (a) bare GCE, (b) GCE/MnO2NRs, (c) GCE/AuNPs, (d) GCE/MnO2NRs@AuNPs (e) GCE/MnO2NRs@AuNPs/antibody, (f) GCE/MnO2NRs@AuNPs/antibody + BSA.