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Cyclic voltammograms of the stimulating site modified with AuNPs (a) and recording site modified with AuNPs (b) in 0.1 M KCl solution containing 2 mM [Fe(CN)6]3−/4−. Scan rate: 20, 50, 100, 150 and 200 mV/s (from a to e). Inset of Figure 12a: cyclic voltammogram of bare stimulating site in 2 mM [Fe(CN)6]3−/4− at scan rate of 100 mV/s. Inset of Figure 12b: cyclic voltammogram of bare recording site in 2 mM [Fe(CN)6]3−/4− at scan rate of 100 mV/s.
