Electrical and Dielectric Properties of Polyaniline and Polyaniline/Montmorillonite Nanocomposite Prepared by Solid Reaction Using Spectroscopy Impedance

Bekri-Abbes, Imene; Srasra, Ezzeddine

doi:10.1155/2015/516902

Cited by 23 publications

(10 citation statements)

References 29 publications

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“…In both samples, at low frequency, both ε′ and ε″ have high magnitude but becomes almost invariant at higher frequencies. Such signature confers that interfacial polarization contribute mostly at lower frequencies, while at higher frequencies, the dipolar relaxation contribution predominates [60,61]. In HCl-treated PA, doping effect generates Polymer Bulletin (2020) 77:4469-4488 polarons/bipolarons that trigger charge delocalization along the polymer chain lengths, which augments the interfacial polarization resulting in large dielectric responses, well in agreement with previous reports [62].…”

Section: Electrical Conductivity Comparative Studysupporting

confidence: 88%

Synthesis, characterization and physicochemical studies of copolymers of aniline and 3-nitroaniline

Waware

Majumdar²

2019

Polym. Bull.

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Polyaniline (PA), the versatile conducting polymer, owing to its tunable optoelectronic properties, facile preparation methodology and reversible redox behavior, has elicited much interest among current researchers, particularly in the fields of energy generation storage devices, protective coatings and electrochemical sensors. However, its commercialization has been much restricted due to low solution processability and thermal stability. Recent studies reveal that the above-mentioned challenges can effectively be addressed by copolymerization of PA with suitable components. In addition, the properties of copolymers could be modified and tuned by varying the monomer ratios. Thus, the present work is concerned with the fabrication of poly(aniline-co-3-nitroaniline) with varying compositions obtained by in situ oxidative copolymerization of aniline and 3-nitroaniline by altering the molar ratio of monomers. Optimization of the physicochemical properties such as UV-visible absorption, solubility, thermal stability, electrical conductivity and dielectric signatures, particle size and morphology was achieved by varying the composition of monomeric substituents in these copolymers. Smoother morphology of the copolymer films was revealed by morphological studies via AFM technique and supported by particle size distribution study. The physicochemical trends demonstrated that proper proportions of nitro (-NO 2) group in the polymer chain are essential to achieve desired optimal physicochemical properties. Therefore, copolymers are ideally appropriate for multifaceted applications and would promote wider usage of conjugated polymers in various fields of organic-based optoelectronic as well as energy storage devices in the near future.

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Section: Electrical Conductivity Comparative Studysupporting

confidence: 88%

Synthesis, characterization and physicochemical studies of copolymers of aniline and 3-nitroaniline

Waware

Majumdar²

2019

Polym. Bull.

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“…This decrease in resistance (an increase in conductivity) with increasing temperature strongly suggest the semiconducting behavior of PAni. 60 However, the electroactivity and conductivity of the PAni film were observed to be stable up to 135–140 °C.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and characterization of a flexible and disposable impedance-type humidity sensor based on polyaniline (PAni)

et al. 2023

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“…This observation can be attributed to long-term membrane capacitance modulation. For example, when neurons are coated with a conducting polymer, electrical capacitance of the hybrid neuronal membrane increases due to large electric permittivity − of the polymer, following C = ε o ε r A / d , where A and d are the surface area and the thickness of the capacitor, ε 0 is the vacuum permittivity and ε r is the dielectric constant of the material. This capacitance change causes a decrease in spiking activity in the recorded single neurons.…”

Section: Modulation Across Different Length Scalesmentioning

confidence: 99%

Nanoenabled Bioelectrical Modulation

Promiński

Miao

et al. 2021

Acc. Mater. Res.

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Conspectus Studying the formation and interactions between biological systems and artificial materials is significant for probing complex biophysical behaviors and addressing challenging biomedical problems. Bioelectrical interfaces, especially nanostructure-based, have improved compatibility with cells and tissues and enabled new approaches to biological modulation. In particular, free-standing and remotely activated bioelectrical devices demonstrate potential for precise biophysical investigation and efficient clinical therapies. Interacting with single cells or organelles requires devices of sufficiently small size for high resolution probing. Nanoscale semiconductors, given their diverse functionalities, are promising device platforms for subcellular modulation. Tissue-level modulation requires additional consideration regarding the device’s mechanical compliance for either conformal contact with the tissue surface or seamless three-dimensional (3D) biointegration. Flexible or even open-framework designs are essential in such methods. For chronic organ integration, the highest level of biocompatibility is required for both the materials and device configurations. Additionally, a scalable and high-throughput design is necessary to simultaneously interact with many individual cells in the organ. The physical, chemical, and mechanical stabilities of devices for organ implantation may be improved by ensuring matching of mechanical behavior at biointerfaces, including passivation or resistance designs to mitigate physiological impacts, or incorporating self-healing or adaptative properties. Recent research demonstrates principles of nanostructured material designs that can be used to improve biointerfaces. Nanoenabled extracellular interfaces were frequently used for either electrical or remote optical modulation of cells and tissues. In particular, methods are now available for designing and screening nanostructured silicon, especially chemical vapor deposition (CVD)-derived nanowires and two-dimensional (2D) nanostructured membranes, for biological modulation in vitro and in vivo. For intra- and intercellular biological modulation, semiconductor/cell composites have been created through the internalization of nanowires, and such cellular composites can even integrate with living tissues. This approach was demonstrated for both neuronal and cardiac modulation. At a different front, laser-derived nanocrystalline semiconductors showed electrochemical and photoelectrochemical activities, and they were used to modulate cells and organs. Recently, self-assembly of nanoscale building blocks enabled fabrication of efficient monolithic carbon-based electrodes for in vitro stimulation of cardiomyocytes, ex vivo stimulation of retinas and hearts, and in vivo stimulation of sciatic nerves. Future studies on nanoenabled bioelectrical modulation should focus on improving efficiency and stability of current and emerging technologies. New materials and devices can access new ...

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Electrical and Dielectric Properties of Polyaniline and Polyaniline/Montmorillonite Nanocomposite Prepared by Solid Reaction Using Spectroscopy Impedance

Cited by 23 publications

References 29 publications

Synthesis, characterization and physicochemical studies of copolymers of aniline and 3-nitroaniline

Synthesis, characterization and physicochemical studies of copolymers of aniline and 3-nitroaniline

Fabrication and characterization of a flexible and disposable impedance-type humidity sensor based on polyaniline (PAni)

Nanoenabled Bioelectrical Modulation

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