Figure 4 | Scientific Reports

Figure 4

From: Label-free electrochemical immunosensor based on enhanced signal amplification between Au@Pd and CoFe2O4/graphene nanohybrid

Figure 4

(A) Nyquist plots of the EIS for each immobilized step of (a) bare GCE, (b) CoFe2O4/rGO/GCE, (c) Au@Pd/CoFe2O4/rGO/GCE, (d) anti-EST/Au@Pd/CoFe2O4/rGO/GCE, (e) BSA/anti-EST/Au@Pd/CoFe2O4/rGO/GCE, (f) estradiol/BSA/anti-EST/Au@Pd/CoFe2O4/rGO/GCE in 1 mmol·mL−1 Fe(CN)63-/4- solution. (B) Amperometric response at −0.3 V vs. SCE for the GCE with different materials modified toward successive addition of 100 μL 1.0 mmol·L−1 H2O2 into pH7.4 PBS buffer solution (0.1 mol•L−1 containing 0.1 mol•L−1 NaCl): (a) bare GCE, (b) CoFe2O4/rGO/GCE, (c) Au@Pd/GCE, (d) Au@Pd/CoFe2O4/rGO/GCE.

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