Effect of electrode conductivity on electrochemically deposited polyaniline films

Kim²,

Kim³

et al. 2011

Conducting polyaniline-poly(ε-caprolactone) polymer composites were synthesized via in situ deposition techniques. By dissolving different weight percentages of poly(ε-caprolactone) (PCL) (10%, 20%, 30%, 40%, and 50%), the oxidative polymerization of aniline was achieved using ammonium persulfate as an oxidant. FT-IR, UV-vis spectra, and X-ray diffraction studies support a strong interaction between polyaniline (PANI) and PCL. Structural morphology of the PANI-PCL polymer composites was studied using scanned electron microscopy (SEM) and transmittance electron microscopy (TEM), and thermal stability was analyzed by thermogravimetric analysis (TGA) technique. The temperature-dependent DC conductivity of PANI-PCL polymer composite films was studied in the range of 305-475 K, which revealed a semiconducting behavior in the transport properties of the polymer films. Conductivity increased with the increase of PCL in below critical level, however conductivity of the polymer film was decreased with increase of PCL concentration higher than the critical value.

mentioning

confidence: 99%

“…After the formation of polymer composites, the particle size decreases in dimensions and merges to form smaller aggregates. 42,43 The morphological changes in the polymer blends may be attributed to the presence of PCL, as evidenced by SEM and TEM image analysis of the polymer films.…”

mentioning

confidence: 99%

Morphology and Charge Transport Properties of Chemically Synthesized Polyaniline-poly(ε-caprolactone) Polymer Films

Kim²,

Kim³

et al. 2011

“…SEM micrographs of the pure PPy and PPy/PbTiO 3 (50 wt %) composites are display- C is due to complete degradation and decomposition of the polymer after the loss of dopant ion. 17 PPy showed a weight loss of 56% up to 800 o C, which increased after the introduction of PbTiO 3 into PPy. The PPy/PbTiO 3 (30 wt %) matrix showed a weight loss of 63%, which further increased to 66% for PPy/PbTiO 3 (50 wt %) composite.…”

Section: Resultsmentioning

confidence: 99%

Preparation, Characterization and Low Frequency a.c. Conduction of Polypyrrole-Lead Titanate Composites

Choi²,

Park³

et al. 2007

Conducting Polypyrrole-lead titanate (PPy/PbTiO 3 ) composites have been prepared by in situ deposition technique by placing different wt.% of fine grade powder of PbTiO 3 (10,20, 30, 40, and 50%) during polymerization of pyrrole. The composites formed were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA), and these data indicate that PbTiO 3 particles are dominating with an increase in crystallinity as well as thermal stability of the composites. The results on the low frequency dielectric studies which are obtained in the form of pressed pellet state are interpreted in terms of Maxwell Wagner polarization, which are responsible for the dielectric relaxation mechanism and frequency dependence of conductivity.

“…27, 28 The electrochemical activity of these composites is enhanced by a slight modification in the composite structure of PANI. Continuous studies are in progress to elucidate the mechanism responsible for the increased electroactivity of PANI-PM composites.…”

Section: Resultsmentioning

confidence: 99%

Thermal and Electrochemical Properties of Polymannuronate-polyaniline Nanocomposites

Veeranagouda²,

Kim³

et al. 2009

New types of conducting polyaniline-polymannuronate (PANI-PM) composites were synthesized by in situ deposition techniques in an aqueous media. By dissolving different weight percentage of polymannuronate (PM) (5, 10, 15, and 25%), the oxidative polymerization of aniline was carried out using ammonium per sulfate as an oxidant. The obtained composites were studied for their thermal stability and electrochemical behavior. The thermal stability of PANI-PM composites is lower than PANI, which supports a strong interaction between PANI and PM. However, the composites show an appreciable electrochemical behavior. Based on these observation the PANI-PM composites can be explored in different fields such as electric devices, sensors, functional coatings, etc.