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Tailoring the working electrode for the electrochemical biosensor. (A) The Au-based electrode was modified with an SAM, then orientation was assisted with protein G, and, finally, conjugated antibody Aβ [55]. (B) The bare GCE electrode was modified with Au and composite of NiFe2O4@GO-Ch, then we conjugated the antibody [65]. SAM, self-assembled monolayer.
