Electrochemical study of anomalous diffusion and fractal dimension in poly ortho aminophenol electroactive film: Comparative study

The poly ortho aminophenol (POAP) films were electropolymerised on graphite electrode using potentiostatic method. POAP films were also characterized by electrochemical impedance spectroscopy (EIS) in wide frequency range. The fractal dimension of poly ortho aminophenol (POAP) films in the presence of different counter ions was investigated. The effect of different anions on the electron conduction of POAP was explained in terms of their abilities to reduce repulsive interactions between redox sites and fractal dimension of the polymer. Diffusion coefficient of counter ions calculated from the slope of the Warburg line of impedance response of the film. A value of γ that is the characteristic of anomalous diffusion is obtained by EIS method and then the relation between fractal dimension and anomalous diffusion has been investigated. The resulting Mott–Schottky plot of the polymer capacitance describes the reduced polymer as a p-type semiconductor.

► Diffusion coefficient of counter ions calculated from the EIS method. ► Fractal dimension and anomalous diffusion parameter γ are interconnected. ► Electrodeposited POAP film is fractal object with semiconductor properties.