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(a) DPV responses of the MXene/PPy modified electrode for the mixture containing DA (12.5–125 μM), UA (50–500 μM), and 1 mM AA; (b) the linear calibration curves for the current response of DA and UA; (c) the stability of the as-prepared sensor after scanning in 0.05 M PBS for 20 cycles; (d) the reproducibility of the as-prepared sensor in 0.05 M PBS containing 50 μM DA and 100 μM UA.
