Electroanalytical studies on electrically conducting polyaniline:polyethyleneterephthalate composite films (original) (raw)
Related papers
Polyaniline Conducting Electroactive Polymers Thermal and Environmental Stability Studies
E-Journal of Chemistry, 2006
In the current studies, polyaniline (PANi) was prepared both chemical and electrochemically in the presence of different bronsted acids from aqueous solutions. The effect of thermal treatment on electrical conductivity, and thermal stability of the PANi conducting polymers were investigated using 4-point probe and TGA techniques respectively. It was found that polymer prepared by CV method is more thermally stable than those prepared by the other electrochemical techniques. In this paper we have also reviewed some fundamental information about synthesis, general properties, diverse applications, thermal and environmental stability of polyaniline conducting polymers.
Study of the Electrical Characteristics of Polyaniline Prepeared by Electrochemical Polymerization
Energy Procedia, 2012
Polyaniline (PAni) is one of imported polymer for synthesis solar cells .The quality of film depended on the method of polymerization. In this research PAni have been prepared by the electrochemical polymerization of aniline on stainless steel electrode. The electrical conductivity of these films was measured by two-probe method .The electrical conductivity is influenced by preparation conduction such as concentration of H 2 SO 4 and current density .The conductivity between (0.1 -10 -10 ) S/cm depends on PH and current density . The best electrical conductivity about (0.1) S/cm was found PH at (4.2) and current density 0.3mA/cm2.
The effect of hydrochloric acid-doped polyaniline to enhance the conductivity
IOP Conference Series: Materials Science and Engineering, 2019
The studies of polyaniline (PANI) and other conducting polymers have shown that they possess semiconducting-properties. PANI is one of the conductive polymers used as a battery electrode, corrosion inhibitor, and sensor. The study aims to investigate the effect of hydrochloric acid dope to PANI. Polyaniline was synthesised by the oxidation of aniline with ammonium peroxidisulphate (APS) as an oxidant by the interfacial method in an immiscible organic/aqueous biphasic system, with hydrochloric acid as a dopant. The result showed that, PANI has conductivities in the range of 3.00.10-2-7.00.10-2 S.cm-1. The morphology and molecular structure of PANI were characterised by scanning electron microscopy (SEM), and FTIR respectively.
Impedance and voltammetric studies of electrogenerated polyaniline conducting films
Synthetic Metals, 1994
Polyaniline thin films were electrochemically synthesized from aniline in three acids: sulfuric, hydrochloric and perchloric. Cyclic voltammetry was used in the electrosynthesis, and the relationship of voltammetric parameters and the properties of the conductive form of the films were investigated. The main tool for film characterization was impedance spectroscopy. Semiautomated plotting of three-dimensional Argand diagrams with a potential parameter was used for synoptic view of the system and nonlinear least-square data fitting was used for rigorous treatment. Charge storage capacity, resistance and changes in constant phase element parameters were analyzed in relation to the use of the three acidic media.
Conductive polymer as Polyaniline (PANI-ES) prepared by chemical oxidation polymerization method at room temperature and studied the effect the dopant sulfuric acid on the structure of the polymer, which prepared with molarity of sulfuric acid (1M), the changes taking place were follow-up by the following measurements: FESEM, FT-IR, I-V character. The diagnosis of the output polymer films by using infrared spectroscopy FT-IR, for doped samples with 1M of sulfuric acid observed change in the intensity of emission opposite the wave number corresponding to each bond, while not noticed any change in the position of the bonds with appearance anew peak return to SO 4 compound. By the FESEM properties of the surface study using the topography FESEM (Field Emission Scanning Electronic Microscopic) and calculated the particle revealed, that the compound has micro granular affected with the presence of acid. Electrical characteristic study by using the two-probe manner, it found that the samples had ohmic plots in which high linear coefficients. The doped samples of polymer had a highest conductivity of 2.98x10-4 S.cm-1 at 383 K, which observed for the H 2 SO 4 doped sample, which shows that was more prominent of localized salt in polymer.
An Insight into Ionic Conductivity of Polyaniline Thin Films
Materials
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.
Polyaniline as cathodic material for electrochemical energy sources
Electrochimica Acta, 2009
Polyaniline layers of different morphologies ranging from open and "sponge-like" structures to compact and "pebble-like" surfaces were synthesized from perchlorate solutions and employed as cathode in the galvanic cell with Zn anode and NH 4 Cl/ZnCl 2 electrolyte. Cathodic properties of synthesized layers were investigated by the constant current charging/discharging method in 500 cycles. Specific charge capacities and specific energies obtained form the current-time curves strongly depend on the morphology of investigated layers and discharge conditions. The results unambiguously show that charging/discharging reaction of polyaniline layers is limited to relatively thin layer at polymer/solution boundary. Specific charge capacities are inversely related to both the polymer thickness and the discharge current density. In the limit of zero current densities the specific charge capacity as high as 245 A h kg −1 could be achieved for porous structures of polyaniline layers. Specific capacitance higher than 400 F g −1 obtained at 2 mA cm −2 current density makes polyaniline a promising material for the application in electrochemical supercapacitors. The electrochemical behaviour of the layers was investigated by cyclic voltammetry and electrochemical impedance spectroscopy before and after 500 cycles of charging/discharging experiments. Both, cyclic voltammetry and electrochemical impedance spectroscopy showed that some polyaniline layers develop an increased charged transfer resistance at the carbon support/polymer interface during charging/discharging process. The increased charge transfer resistance does not affect the overall specific charge of the layers. The low-frequency capacities in impedance spectra are attributed to charging/discharging of polymer/electrolyte interface and seem to be related to the specific charge capacities obtained by extrapolation to zero current density discharge reaction.
Comparison of Chemically and Electrochemically Prepared Polyaniline. Films. 1. Electrical Properties
Chemistry of Materials, 1995
Relaxation phenomena in thin polyaniline films synthesized chemically and electrochemically are investigated by UV-vis and IR spectroscopy. It is shown that the relaxation process carried out from the electrochemically oxidized or electrochemically reduced states of the polyaniline always proceeds toward the emeraldine state. The relaxation process in acid is governed by disproportionation and formation of semiquinone radicals. The changes in the population density of the polaronic states within the polaronic band allows determination of the change in the oxidation state and consequently the change in the position of the Fermi energy level. The formation of polaronic states is ascertained by diffusion of ions from or into t h e polyaniline matrix in solution and
Effect of temperature on the electrochemical synthesis and properties of polyaniline films
Journal of Non-Crystalline Solids, 2010
The effect of temperature on the electrochemical oxidative polymerization of aniline and on the electrochemical properties of the resulting polyaniline (PANI) film was studied. The electrochemical deposition of PANI has been carried out on platinum at different temperatures. Three different films (PANI-25, PANI-40 and PANI-60) have been prepared at 25, 40 and 60°C by electrochemical polymerization and characterized by cyclic voltammetry and electrochemical impedance spectroscopy. Increasing the synthesis temperature leads to an increase of the polyaniline films thickness from 0.4 to 0.9 lm and, respectively, 1.1 lm, associated with an increase of the films capacitances from 3 Â 10 À2 F cm À2 to 7 Â 10 À2 F cm À2 and 10 Â 10 À2 F cm À2 . The impedance measurements showed that only PANI-25 and PANI-40 exist in the conductive state over a large potential window, while PANI-60 has an intermediate behavior at low and high electrode potentials.