Interfaced conducting polymers

Stejskal, Jaroslav; Bober, Patrycja; Bovtun, V.; Savinov, M.; Petzelt, J.; Prokeš, Ján

doi:10.1016/j.synthmet.2016.12.029

Cited by 16 publications

(7 citation statements)

References 53 publications

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“…Several parameters influence on the mobility of counter ions along the polymer chains in ICP materials. These factors are mainly related to the (i) synthesis methodology [32][33][34], (ii) regular packing of the polymer chains (or polymer crystallinity), (iii) ring side group at the ortho, meta, or para positions [8,[35][36][37], and (iv) the nature of the doping acid and counter ion size [38], as well as (v) the possible chemical and/or physical interactions between counter ions and ring side groups [39].…”

Section: Electrical Conductivitymentioning

confidence: 99%

Poly(o-methoxyaniline) Chain Degradation Based on a Heat Treatment (HT) Process: Combined Experimental and Theoretical Evaluation

et al. 2022

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Poly(o-methoxyaniline) emeraldine-salt form (ES-POMA) was chemically synthesized using hydrochloric acid and subjected to a heat treatment (HT) process for 1 h at 100 °C (TT100) and 200 °C (TT200). The HT process promoted a progressive decrease in crystallinity. The Le Bail method revealed a decomposition from tetrameric to trimeric-folded chains after the HT process. The unheated POMA-ES presented a globular vesicular morphology with varied micrometric sizes. The heat treatment promoted a reduction in these globular structures, increasing the non-crystalline phase. The boundary length (S) and connectivity/Euler feature (χ) parameters were calculated from the SEM images, revealing that ES-POMA presented a wide distribution of heights. The TT100 and TT200 presented a narrow boundary distribution, suggesting smoother surfaces with smaller height variations. The UV-VIS analysis revealed that the transition at 343 nm (nonlocal π → π*) was more intense in the TT200 due to the electronic delocalization, which resulted from the reduced polymer chain caused by the HT process. In addition to the loss of conjugation, counter ion withdrawal reduced the ion-chain interaction, decreasing the local electron density. This result shows the influence of the chlorine counter ions on the peaks position related to the HOMO → LUMO transition, since the π → polaron transition occurs due to the creation of the energy states due to the presence of counter ions. Finally, the electrical conductivity decreased after the HT process from 1.4 × 10−4 S.cm−1 to 2.4 × 10−6 S.cm−1 as result of the polymer deprotonation/degradation. Thus, this paper proposed a systematic evaluation of the POMA molecular structure and crystallite size and shape after heat treatment.

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Section: Electrical Conductivitymentioning

confidence: 99%

Poly(o-methoxyaniline) Chain Degradation Based on a Heat Treatment (HT) Process: Combined Experimental and Theoretical Evaluation

et al. 2022

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“…In this case, a remarkable effect on the slope of AC conductivity is expected. Figure 2 shows the broad-band AC conductivity spectra of poly(p-phenylenediamine) (PPDA) in which measurements in microwave (MW) and FIR frequencies are included [45]. In order to fit the data of Figure 2, Equation ( 9) is used with k = m = 1 and two HN terms.…”

Section: γ/2π (Thz)mentioning

confidence: 99%

Exploring the High Frequencies AC Conductivity Response in Disordered Materials by Using the Damped Harmonic Oscillator

Tsonos

2022

J. Compos. Sci.

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The AC conductivity response of disordered materials follows a universal power law of the form σ′(ω)∝ωn at the low frequency regime, with the power exponent values in the range 0 < n < 1. At the high frequency regime, in many experimental data of different disordered materials, superlinear values of the power exponent n were observed. The observed superlinear values of the power exponent are usually within 1<n<2, but in some cases values n>2 were detected. The present work is based on the definitions of electromagnetic theory as well as the Havriliak–Negami equation and the damped harmonic oscillator equation, which are widely used for the description of dielectric relaxation mechanisms and vibration modes in the THz frequency region, respectively. This work focuses mainly on investigating the parameters that affect the power exponent and the range of possible n values.

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“…The scientific literature reported that several factors influence on the mobility of counterions along the polymer chains in polyaniline and its derivatives. These factors are related to (i) the different synthesis methodologies [107][108][109], (ii) the regular packing of the polymer chains (or polymer crystallinity), (iii) the ring side group at the ortho, meta or para positions [103,[110][111][112], (iv) the nature of the doping acid and counterion size [113], as well as (v) possible interactions between counterions and the ring side group.…”

Section: Complex Impedance Spectroscopy Analysismentioning

confidence: 99%

Chemically synthesized poly(o-methoxyaniline): Influence of counterions on the structural and electrical properties

Biondo

Oliveira

Lima

et al. 2020

Journal of Molecular Structure

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Interfaced conducting polymers

Cited by 16 publications

References 53 publications

Poly(o-methoxyaniline) Chain Degradation Based on a Heat Treatment (HT) Process: Combined Experimental and Theoretical Evaluation

Poly(o-methoxyaniline) Chain Degradation Based on a Heat Treatment (HT) Process: Combined Experimental and Theoretical Evaluation

Exploring the High Frequencies AC Conductivity Response in Disordered Materials by Using the Damped Harmonic Oscillator

Chemically synthesized poly(o-methoxyaniline): Influence of counterions on the structural and electrical properties

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