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Scanning electron microscopy (SEM) image of bare PG electrode (A) and AChENPs/ChONPs/GONS/PtNPs nanocomposite onto PG electrode (B). (AChENPs = Acetylcholine esterase nanoparticles; ChONPs = Choline oxide nanoparticles; GONS = Graphene nanosheets; PtNPs = Platinum nanoparticles; PGE= Pencil graphite electrode).
