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SEM images of Au nanocrystal deposited on the graphene/Au disk electrode under the same potential of −0.2 V with varied electrical quantities: (a) 2 × 10−3 C; (b) 3 × 10−3 C; (c) 4 × 10−3 C; (d) 5 × 10−3 C; (e) 10 × 10−3 C; and (f) 15 × 10−3 C. (g) The current signal of the amperometry response of the GOx/AuNC/graphene/Au disk electrode with varying electrical charges. Reprinted with permission from ref. [143]; Copyright 2015 Elsevier.
