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DPVs performed in PBS in the absence of PyoV for reduced graphene/graphite SPE modified with AuNPs (black (a)), and performed in 100 µM PyoV in PBS for bare graphene/graphite SPE (red (b)); reduced graphene/graphite SPE (green (c)), and reduced graphene/graphite SPE with AuNPs (blue (d)) (20 mM PBS pH 7.4; from −0.3 to +0.8 V vs. Ag/AgCl; 0.02 V·s−1).
