Spectroscopic Studies of Nano Size Crystalline Conducting Polyaniline

Kavitha, B.

doi:10.9790/5736-0211619

Cited by 24 publications

(13 citation statements)

References 3 publications

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“…48 This clearly indicated that upon coating of ES on the copper surface, the rate of HER increased in comparison with that on the Cu surface. 51,52 A broad peak at 8.65 ppm and a single peak at 9.3 ppm were also observed. This observation was in accordance with previous literature reports that stated that these 3 peaks were characteristic of 1 H coupled to 14N and confirmed the protonated state (N─H + ) of the PANI backbone.…”

Section: Correlation Between Work Function and Exchange Current Denmentioning

confidence: 87%

“…50 A set of 3 doublets were also observed at 7.33, 7.36, and 7.46 ppm, which corresponded to the proton peak of ─CH at benzoid and quiniod rings. 51,52 A broad peak at 8.65 ppm and a single peak at 9.3 ppm were also observed. The former was assigned for a secondary amine (─NH) peak of PANI, while the latter was attributed to intermolecular hydrogen bonding between the solvent (H 2 O) and ─NH group of PANI.…”

Section: Correlation Between Work Function and Exchange Current Denmentioning

confidence: 87%

“…equal intensity. 52 It should be noted here that amine protons were generally not observed in solution because of the fast exchange with the solvent proton. 50 A set of 3 doublets were also observed at 7.33, 7.36, and 7.46 ppm, which corresponded to the proton peak of ─CH at benzoid and quiniod rings.…”

Section: Correlation Between Work Function and Exchange Current Denmentioning

confidence: 88%

“…The former was assigned for a secondary amine (─NH) peak of PANI, while the latter was attributed to intermolecular hydrogen bonding between the solvent (H 2 O) and ─NH group of PANI. 52 It should be noted here that amine protons were generally not observed in solution because of the fast exchange with the solvent proton. Since in the present case the spectra were recorded in DMSO-d 6 , the solvent exchange of ─NH protons was slow enough to be observed.…”

Section: Correlation Between Work Function and Exchange Current Denmentioning

confidence: 88%

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Storage and evolution of hydrogen in acidic medium by polyaniline

et al. 2017

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Summary Emeraldine salt of polyaniline‐coated copper substrate was used as a cathode to study hydrogen evolution reaction in 1M H2SO4. Hydrogen evolution reaction in acidic medium followed Grotthus mechanism, where proton hops randomly on the surface of polyaniline. With Randles‐Sevcik equation, the average value of diffusion coefficient for H+ on polyaniline was calculated to be 2.66 times higher than that in the literature data. This higher value explicitly supported the rapid diffusion of H+ on polyaniline surface from the bulk electrolyte solution. With the help of a phenomenological thermodynamic approach demonstrated elsewhere, the solvent‐modified work function of polyaniline‐coated copper in acidic medium was calculated. The plot of exchange current density versus solvent‐modified work function of different metals and polyaniline‐coated copper indicated that at lower work function polyaniline‐coated copper showed higher exchange current density and the rate of hydrogen evolution was much higher on polyaniline‐coated copper than on copper. This was further confirmed by gas chromatography, and 13C and 1H nuclear magnetic resonance studies supported the mechanism proposed. From linear sweep voltammetry analysis, it was observed that the total capacity of hydrogen stored on polyaniline‐coated copper was approximately 1.85 times higher than that on copper.

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Section: Correlation Between Work Function and Exchange Current Denmentioning

confidence: 87%

Section: Correlation Between Work Function and Exchange Current Denmentioning

confidence: 87%

Section: Correlation Between Work Function and Exchange Current Denmentioning

confidence: 88%

Section: Correlation Between Work Function and Exchange Current Denmentioning

confidence: 88%

See 2 more Smart Citations

Storage and evolution of hydrogen in acidic medium by polyaniline

et al. 2017

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“…The Raman frequency related to conductivity, for a 514 nm excitation line, is localized at frequencies between 1335 and 1339 cm -1 (Moráviková et al, 2012;Lapiński and Dubis, 2012). In the UV-Visible spectra, the protonated form of PAni shows absorption bands at 335 -340 nm, 440 -480 nm and 800 -870 nm (Rao et al, 2000;Kavitha et al, 2012). The frequencies relating to PAni protonated in FTIR spectra bands were found with very low intensities, indicating that these bands can be trace amounts.…”

Section: Polymerization Of Anilinementioning

confidence: 99%

Influence of reaction time on the structure of polyaniline synthesized on a pre-pilot scale

Mazzeu

Faria

Baldan

et al. 2018

Braz. J. Chem. Eng.

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The aim of this work is to follow the structural variations of polyaniline (PAni) obtained by chemical oxidation on a pre-pilot scale, with different reaction times. Synthesis of PAni is well known, but when it is carried out on a pre-pilot scale, several factors can lead to structural changes and understanding these changes is important to improve controls on the synthesis process. The polymers formed were characterized by spectroscopic techniques (Raman spectroscopy, Fourier Transform Infrared-FTIR and UV-Visible). Degree of oxidation and yield were calculated for each reaction time. The analysis by FTIR, the calculated degree of oxidation and the yield showed significant changes in polymer structure at reaction times of 65 and 80 min. This result was attributed to the excessive oxidation of PAni, with the breaking of its polymer chain. The changes observed in the structure of PAni gave subsidies to the optimization of the process of obtaining polyaniline by chemical synthesis.

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Growth Processes and Morphological Evolution of Polyaniline Film During Potentiostatic Growth

Kim

2017

Bulletin Korean Chem Soc

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We have investigated the potentiostatic growth processes and morphological evolution of polyaniline film on an indium tin oxide (ITO) electrode. The current-time transient shows the existence of three stages in two growth regimes. As the initial formation of polyaniline is extremely fast, the current increases rapidly with time. Subsequently, the current increase is slowed down due to the decomposition reaction competes with polymerization. Polyaniline film grown rapidly on a bare ITO electrode shows a compact twodimensional layer with a granular structure. The granules start to grow upward on the first layer, with one-dimensional growth resulting in a loosely bound and open fibrous structure. Further polymer film growth results in surface aggregates due to the increased degradation rate. Visualization of the surface morphology and the roughness of the grown film are consistent with the proposed growth processes.

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Spectroscopic Studies of Nano Size Crystalline Conducting Polyaniline

Abstract: Polyaniline (PANI) 452, 7.468, 7.505, 7.525, 7.604, 7.638 ppm. The lower three peaks at (δ = 7.452, 7.468, 7.505 ppm) are attributed to the protons related to the 14 N nucleus. These spectral lines intensity ratio lies as 1:1:1. Another three peaks at (δ = 7.525, 7.604, 7.638 ppm)

Cited by 24 publications

References 3 publications

Storage and evolution of hydrogen in acidic medium by polyaniline

Storage and evolution of hydrogen in acidic medium by polyaniline

Influence of reaction time on the structure of polyaniline synthesized on a pre-pilot scale

Growth Processes and Morphological Evolution of Polyaniline Film During Potentiostatic Growth

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