Research Article

A Novel Sandwich Electrochemical Immunosensor Based on the DNA-Derived Magnetic Nanochain Probes for Alpha-Fetoprotein

Figure 3

AC impedance spectrum of (a) GCE, (b) GCE/nafion-nano Au, (c) GCE/Nafion-Au NPs/AFP Ab/AFP, and (d) GCE/Nafion-Au NPs/AFP Ab/AFP/(DNA/(ZMPs-HRP-AFP Ab2)n) in 5 mmol/L Fe(CN)63−/4− + 0.5 mol/L KCl solution.
957805.fig.003