Electrochemical Analysis of Conducting Polymer Thin Films

Abstract

Polyelectrolyte multilayers built via the layer-by-layer (LbL) method has been one of the most promising systems in the field of materials science. Layered structures can be constructed by the adsorption of various polyelectrolyte species onto the surface of a solid or liquid material by means of electrostatic interaction. The thickness of the adsorbed layers can be tuned precisely in the nanometer range. Stable, semiconducting thin films are interesting research subjects. We use a conducting polymer, poly(p-phenylene vinylene) (PPV), in the preparation of a stable thin film via the LbL method. Cyclic voltammetry and electrochemical impedance spectroscopy have been used to characterize the ionic conductivity of the PPV multilayer films. The ionic conductivity of the films has been found to be dependent on the polymerization temperature. The film conductivity can be fitted to a modified Randle’s circuit. The circuit equivalent calculations are performed to provide the diffusion coefficient values.

Conducting Polymer-Based Multilayer Films for Instructive Biomaterial Coatings

“…Conductive multilayer films have been prepared from a variety of organic electronic components, often for applications in energy, of which a number of examples based on CPs exist [17]. Wallace and co-workers reported the preparation of bioerodible CP-based multilayer films based on an anionic sulfonate-displaying polythiophene derivative (with a M w = 13,160 Da and M n = 6682 Da as determined by GPC) and cationic polyethyleneimine (17 kDa) [18], both of which are below the renal filtration limit of approximately 50 kDa [11], and the films were shown to be suitable for the growth and proliferation of cells derived from the connective and muscle tissue of mice (L929 and C2C12 cells, respectively) [18].…”

Flexible Electrochemical Transducer Platform for Neurotransmitters

“… 60 The surface of PTS is endowed with a large distribution of reduced and oxidized ions where the reduced form of the film can mediate the electron transfer for oxidation of analyte molecules. 61 The increase in the oxidation peak current values can be correlated with the enhanced electrochemical activity of PTS3 toward EP. The hike in the anodic current can be arising from the strong combination of the electron-rich oxygen atom of titania and the presence of conjugated π–π and reducible cation radicals present in PEDOT film.…”

Impedance spectroscopy of ions at liquid-liquid interfaces

“…The situation is different for the cited studies of interfaces between molecular solvents and PEMs, where both phases can be considerably larger than the Debye lengths, but the relaxation times of the PEMs can be sub- * Electronic address: reindl@is.mpg.de † Electronic address: bier@is.mpg.de stantially longer than for molecular solvents [18] so that PEM bulk processes occur at frequencies which are not separate from frequencies of interfacial processes. Consequently, the equivalent circuits used in these studies did not attempt to account for the PEMs just by an Ohmic resistor alone but also by some capacitive behavior.…”

“…(16) two more conditions are required in order to solve the linear system Eq. (18). Firstly, we demand continuity of the electrostatic potential φ -also at z = R. Secondly, continuity of the dielectric displacement D is assumed which implies that there is no surface charge at the interface.…”