Polyaniline: Thin films and colloidal dispersions (IUPAC Technical Report)

Polyaniline (PANI), a conducting polymer, was prepared by the oxidation of aniline with ammonium peroxydisulfate in various aqueous media. When the polymerization was carried out in the solution of strong (sulfuric) acid, a granular morphology of PANI was obtained. In the solutions of weak (acetic or succinic) acids or in water, PANI nanotubes were produced. The oxidation of aniline under alkaline conditions yielded aniline oligomers. Fourier transform infrared (FTIR) spectra of the oxidation products differ. A group of participants from 11 institutions in different countries recorded the FTIR spectra of PANI bases prepared from the samples obtained in the solutions of strong and weak acids and in alkaline medium within the framework of an IUPAC project. The aim of the project was to identify the differences in molecular structure of PANI and aniline oligomers and to relate them to supramolecular morphology, viz. the nanotube formation. The assignment of FTIR bands of aniline oxidation products is reported.

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“…This band has been attributed to the HSO 4 -counterion, which was removed during the deprotonation [32,34] (Fig. 3).…”

Section: Granular Pani Samples H and H-bmentioning

confidence: 99%

“…PANI exists in variety of supramolecular morphologies [1]. PANI nanogranules are obtained when aniline is polymerized in strongly acidic aqueous media, which are currently used for the synthesis of a conducting PANI [2][3][4]. Oxidation in solutions of weak acids often produced PANI nanotubes.…”

Section: Introductionmentioning

confidence: 99%

Polyaniline: The infrared spectroscopy of conducting polymer nanotubes (IUPAC Technical Report)

Trchová

Stejskal

2011

Pure and Applied Chemistry

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530

241

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“…Many studies used glass slides, because they are transparent and chemically stable, e.g. Stejskal et al used glass slide as a substrate for PANI thin films [11]. Our study shows the modification of the conductivity of PANI thin films by the postsynthetic high-voltage (HV) electrical field treatment in the range 0.6 -2.7 kV/cm.…”

Section: Introductionmentioning

confidence: 62%

Formation and Implementation of PANI Thin Film Polymerization

Shukla¹

2018

IJRASET

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Polyaniline (PANI) is one of the most studied and applied conducting polymers because of the unique conduction mechanism and high environmental stability. PANI could be synthetized by chemical or electrochemical methods. For this study PANI thin films deposited on glass substrate were prepared by chemical bath deposition from anilinium sulfate (precursor) using ammonium peroxodisulfate as strong oxidizing agent. Prepared samples were dried in high voltage static electric field (0.6 -2.7 kV/cm). The most important effect was the increase of PANI thin film conductivity. Results showed changes in the microstructure, morphology, and conductivity of PANI thin films in dependence on high voltage electrical field. Optical transmittance was studied by UV-VIS spectroscopy and Raman microspectroscopy was used to study structural changes in PANI chains. Variances in the range 1480-1650 cm-1 was revealed in Raman spectra. The dependence of conductivity on electric field intensity showed the maximum for samples dried in field of intensity 1.0 kV/cm. This conductivity was 374 S/m. Presented results show the possibility to change the structure properties of PANI thin films using high voltage static electrical field.

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“…The next step refers to formation of dimers by coupling of cation radicals followed by the loss of protons (deprotonation) and rearomatization. Lately, the dimers are oxidized to form dimer radical cations reacting with other cation radicals leading to chain propagation [31,65,66]. After the oxidant is completely consumed, aniline in solution reduces PS to form ES as seen in Fig.3.…”

Section: Polianiline Synthesismentioning

confidence: 99%