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. 2016 Feb 16;6:21281. doi: 10.1038/srep21281

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(A) Ameperometic response: (a) bare GCE, (b) GO, (c) GS-Fe₃O₄, (d) Au@Ag NPs, (e) Au@Ag/GS-Fe₃O₄, (f) Au@Ag/GS-Fe₃O₄/Cd²⁺; (B) CV of the immunosensor: a bare GCE was scanned in 0.1 mg/mL of Cd²⁺ from −1.0 V to 1.0 V (a); using Au@Ag/GS-Fe₃O₄ as signal amplification platform (c); using Au@Ag/GS-Fe₃O₄/Cd²⁺ as signal amplification platform in PBS at pH = 6.8 before (b) and after (d) the addition of 5 mM H₂O₂; (C) Nyquist plots of the EIS method: GCE (a), Au@Ag/GS-Fe₃O₄/Cd²⁺/GCE (b), anti-IgG/Au@Ag/GS-Fe₃O₄/Cd²⁺/GCE (c), BSA/anti-IgG/Au@Ag/GS-Fe₃O₄/Cd²⁺/GCE (d), IgG/BSA/anti-IgG/Au@Ag/GS- Fe₃O₄/Cd²⁺/GCE (e).