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Voltammetric curves of different modified electrodes in 0.05 M PBS (pH 7.0) in presence of 100 μM RhB at 0.1 V/s (A). Voltammetric curves of Ag-3/ZnO/SPCE at different pH from pH 3 to pH 11 in presence of 100 μM RhB at 0.1 V/s (B). The pH against peak current and potential (C).
