A sensor of a polyoxometalate and Au-Pd alloy for simultaneously detection of dopamine and ascorbic acid

A composite film based on K8P2W16V2O62·18H2O decorated by Au-Pd nanoparticles was prepared by the layer-by-layer self-assembly method. This composite film exhibits enhanced electrocatalytic performance, repeatability and long-term stability for the simultaneous determination of dopamine and ascorbic acid at biological pH (pH 7.0). The proposed electrochemical sensing film for simultaneous detecting dopamine and ascorbic acid shows rather low detection limit of 8.3 × 10−7 and 4.3 × 10−7 M and a linear response range from 2.1 × 10−6 to 2.06 × 10−3 M and 1.2 × 10−6 to 1.61 × 10−3 M, as well as no interference from the common interfering species at an applied potential.