Electrochemical sensor based on Ti3C2/MnO/NiNPs composite material for simultaneous detection of ascorbic acid and dopamine

In this study, NiMn MOFs were in-situ grown on Ti 3 C 2 and then calcined at high temperature to obtain the Ti 3 C 2 /MnO/NiNPs nanocomposites. A series of characterization including SEM, TEM, XRD, XPS and electrochemical techniques were carried out to investigate the elemental composition, morphology, structure and performance of the materials. The experiments demonstrated that the sensor based on this material has good electrocatalytic activity to redox reactions of ascorbic acid (AA) and dopamine (DA) and could simultaneously detect them. Under the optimal conditions, the oxidation currents of AA and DA showed significant linear relationships with their concentrations in the ranges of 50.00–6000.00 μM and 0.20–120.00 μM, respectively. The detection limits were 17.92 μM and 0.03 μM, respectively. This sensor could effectively detect AA and DA in artificial urine samples simultaneously, and exhibited good stability, repeatability, anti-interference ability and a wider linear range, showing potential application prospects.