The NiHCF PEDOT, CuHCF PEDOT and MnHCF PEDOT films were prepared on glassy car bon electrode (GCE) by multiple scan cyclic voltammetry and characterized using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and scanning electron microscope (SEM) techniques. The advantages of these films are demonstrated for selectivity detection of ascorbic acid using cyclic voltammetry and amperometric method. Interestingly, the NiHCF PEDOT and CuHCF PEDOT modified electrodes exhibited a wide linear response range (5 × 10 -6 -3 × 10 -4 M, R 2 = 0.9973 and 1.8 × 10 -3 -1.8 × 10 -2 M, R 2 = 0.9924). The electrochemical sensors facilitated the oxidation of AA but not responded to other electroac tive biomolecules such as dopamine, uric acid, H 2 O 2 , glucose. The difference is MnHCF PEDOT/GCE that no response to AA. In addition, the NiHCF PEDOT and CuHCF PEDOT modified electrodes exhibited a distinct advantage of simple preparation, specificity, stability and reproducibility.
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