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. 2021 Apr 28;21(9):3069. doi: 10.3390/s21093069

Figure 4.

Figure 4

(a) Nyquist plots of bare, PPy modified, and MXene/PPy modified electrodes in the presence of 10 mM (Fe(CN)6)3-/4- containing 0.1 M KCl; (b) the CV curves of the MXene/PPy modified electrode with different scan rates (50, 100, 150, 200, 250, and 300 mV/s) in 10 mM K3(Fe(CN)6) containing 3 M KCl; (c) the calibration curves of current peak vs. the square root of the scan rate for PPy modified and MXene/PPy modified electrodes; (d) the CV responses of the MXene/PPy modified electrode for 1 mM AA, 50 μM DA, and 100 μM UA in 0.05 M PBS; (e,f) the calibration curves of the current peak vs. the square root of the scan rate for the MXene/PPy modified electrode in 0.05 M PBS containing 50 μM DA and 100 μM UA, respectively (the insert shows the CV curves of the MXene/PPy modified electrode with different scan rates (50, 60, 70, 80, 90, 100, and 110 mV/s)).