Figure 4.
Cyclic voltammograms (CV) of the bare glassy carbon electrode (GCE), RGO/GCE and NH2–Fe3O4/RGO/GCE in 5 × 10−4 mol/L of [Fe(CN)6]3−/4− solution. The CVs were recorded in 0.1 mol/L PBS (pH 3.5) at the scan rate of 100 mV/s.
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