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(a) Cyclic voltammogram and inset is the corresponding bar chart diagram of peak current of 0.1 M phosphate buffer of pH 4 containing 100 μM carbaryl using bare SPCE, SPCE-A400, SPCE-A600, and SPCE-AuNR800, (b) plots of peak current vs the pH value, and (c) linear relationship between peak current of carbaryl oxidation with its pH solution measured from 100 μM carbaryl in 0.1 M phosphate buffer in various pH values (3–6) in SPCE-A400.
