Fig. 6. (a) CV curves of bio-ZnO NPs, bio-AgNPs, bio-Ag/ZnO, Z70 modified electrodes using 0.1 M PBS (pH 3.0) in 100 mM CBR; (b and d) the corresponding bar chart diagram of irreversible oxidation peak current responses for CBR; (c) CV curves of SPE and Z70/SPE, Z80/SPE, and Z90/SPE-modified electrodes using 0.1 M PBS (pH 3.0) in 100 μM CBR. The scan rate is 50 mV s−1.
