The Synergic Effect of Conducting Polymer/Ionic Liquid Composite Electrodes on the Voltammetric Sensing of Biomolecules

[[abstract]]A novel modified screen-printed carbon electrode (SPCE) was constructed by spin-coating room temperature ionic liquid, 1-butyl-3-methylimidazolium chloride ([BMIM][Cl]), into electropolymerized conducting polymer matrix of poly(3,4-ethylenedioxythiophene) (PEDOT). The resulting surface morphology was characterized by scanning electron microscopy. X-ray photoelectron spectroscopy was employed to confirm the successful surface modification. Cyclic voltammograms have shown that the composite film-modified electrode combined the advantages of conducting polymer and ionic liquids, and exhibited good electrocatalytic activity for biomolecules. The results showed lowering the overpotentials and enhancing current responses, without showing any fouling effect. The proposed method was applied to the simultaneous determination of dopamine (DA), ascorbic acid (AA) and uric acid (UA) in pH 7.0 PBS.[[note]]SC