Electrochemical Impedance Spectroscopy Using Interdigitated Gold–Polypyrrole Electrode Combination

A novel electrochemical impedance spectroscopy (EIS) sensor design, based on a standard interdigitated electrode arrangement in which the working electrode consists of gold and the combined counter and reference electrodes of polypyrrole doped with polystyrene sulfonate (PPy:PSS), is evaluated for biosensing applications. The performance is successfully proved by immobilization of a thiolated biotin as a self‐assembled monolayer (SAM), followed...