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(a) DPVs recorded for Ti3C2Tx@TiO2 NSs/GCE for different concentrations of AA (200–1000 μM), DA (40–300μM) and UA (50–400μM). (b–d) Linear calibration curves for the oxidation peak currents vs. concentrations of AA, DA and UA. Error bars based on S/N = 3.
