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FE-SEM images of: (A) screen-printed carbon electrodes (SPCE), (B) activated SPCE (aSPCE), (C) poly(Azure A) (PAA)-aSPCE, (D) platinum nanoparticles (PtNPs)-PAA-aSPCE, and (E) glucose oxidase (GOx)-PtNPs-PAA-aSPCEs, with a magnification of 30,000 K.
