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(A) Voltammetric curves of Ag-3/ZnO/SPCE under different additions of RhB from 50 μM to 500 μM to 0.05 M PBS (pH 7) at 0.1 V/s and (B) Corresponding linear plot. (C) Voltammetric curves of Ag-3/ZnO/SPCE under different scan rates from 0.02–0.2 V/s and (D) corresponding linear plot.
