Disposable Carbon Dots Modified Screen Printed Carbon Electrode Electrochemical Sensor Strip for Selective Detection of Ferric Ions

Figure 4

(a) Cyclic voltammogram and (b) Nyquist plot of (I) Fe³⁺ immobilized C-Dots modified SPCE, (II) C-Dots modified SPCE, (III) Fe³⁺ immobilized unmodified SPCE, and (IV) unmodified SPCE. Both CV and EIS were conducted in 0.01 M HCl at a scan rate of 100 mVs⁻¹ and within the frequency range of 0.01 Hz to 10.0 kHz, respectively.

(a)

(b)