Abstract
The work addresses an issue of the conductivity phenomenon in conductive polymer thin films. Polyaniline was chosen as a broadly used and thoroughly investigated conductive polymer in order to test and show capabilities of the developed original approach based on impedance spectra analysis. A number of films of different thickness were deposited onto a Pt electrode surface and consequently investigated in aqueous solution containing perchloric acid as an electrolyte. The processes that occur in polyaniline film were studied by cyclic voltammetry, electrochemical quartz crystal microgravimetry (EQCM) and electrochemical impedance spectroscopy (EIS). The role of incorporated ions as charge carriers was investigated with respect to the control of the conductivity properties of the film. Along with detailed polyaniline behavior study, the work makes up a fundamental scientific impact on theoretical electrochemistry and electroanalytical techniques.
Highlights
The electrochemistry of conductive polymers has remained an object of interest for the last several decades for several reasons including the unique properties of this type of material, the diversity of its application, and the inexhaustible possibility of its structure modification
Polyaniline film was deposited onto an electrode surface from aqueous solution containing
Polyaniline exists in three forms: the neutral form
Summary
The electrochemistry of conductive polymers has remained an object of interest for the last several decades for several reasons including the unique properties of this type of material, the diversity of its application, and the inexhaustible possibility of its structure modification. The currently developing organic electronics area raised conductive polymers to the top perspective on materials covering a wide range of applications [1,2]. Mechanisms of charge transport in conductive polymers are known generally, there is still neither conventional quantitative data describing these aspects, nor a universal strategy for charge transfer parameters estimation. Conductivity is not a constant characteristic of the material. It is a complicated function of basic charge transport parameters: charge density and mobility. Real systems include more than one type of mobile charge carrier and their density and mobility are functions of the applied electric field
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