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(a) CV responses of Ag-ZnO/GCE at different 4-NP concentrations (10 µM to 500 µM) containing 0.1 M PBS (pH = 7) solution at a scan rate of 100 mVs−1. (b) Linear regression plot of current vs. 4-NP concentration. (Accumulation time: 2 min, catalyst loading volume: 10 µL).
