Effect of polyaniline on the structural, conductivity, and dielectric properties of chitosan

Santos, Nicole Ashley V.; Pulido, Marta; Tumacder, Doebner Von; Taaca, Kathrina Lois M.

doi:10.1016/j.carpta.2021.100129

Cited by 16 publications

(5 citation statements)

References 86 publications

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“…The utility of such biopolymer hybrid materials is promising due to their amenability for diverse applications such as wearable electronics for advanced healthcare materials to biomedical sensors for humidity and urea detection. The biocompatibility and tunable electromechanical properties of such biopolymer hybrid composites continue to generate significant interest, according to the recent progress in the field. − While there is a need to carry out systematic water vapor adsorption–desorption studies across a range of conditions to assess the technology readiness level of hybrid biopolymer composites, this study reveals the ability to tune the structural and electronic properties of these materials for humidity sensing applications.…”

Section: Resultsmentioning

confidence: 99%

Renewable Hybrid Biopolymer/Polyaniline Composites for Humidity Sensing

Anisimov

Evitts

Cree

et al. 2022

ACS Appl. Polym. Mater.

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The current study was focused on electrically conductive polyaniline (PANI)-based polymer composites and their films, which contain poly(vinyl alcohol) (PVA). The goal of this research was to evaluate PANI composites that contain biopolymer platforms (chitosan or cellulose micro-powder) as materials for humidity sensing, which were compared against composites that contain carbon nanofibers in lieu of the biopolymer. Ternary film materials were prepared by a two-step method: (1) in situ polymerization of PANI onto the biopolymer or carbon support to yield a binary composite, and (2) physical blending of the resulting binary composite with PVA to yield a ternary composite in a film form. The following mechanical properties were estimated: (a) elastic (Young’s) modulus and stiffness, (b) ductility and toughness, and (c) yield and tensile strength. The Young’s modulus improved as the chitosan fraction increased, which indicates that chitosan can be used as a mechanical reinforcement additive for PANI-based composites. The electrical properties were characterized by plots of electrical conductivity versus relative humidity, whereas mechanical properties were evaluated using tensile testing. Overall, chitosan-based films showed good mechanical properties, moderate electrical conductivity, and favorable high humidity response and moisture uptake. Cellulose- and carbon-based composites were generally inferior to chitosan for most properties, except for higher conductivity. Due to the high brittleness of carbon-based composites, the practical utility of carbon nanofibers for humidity sensing is limited in the case of pristine carbon materials. This work reveals that ternary PANI-based composites are potential candidates for humidity sensor materials, where moderate PANI-to-chitosan/cellulose/carbon ratios enable good moisture uptake and electromechanical properties of composites. PANI/biopolymer composites are a promising class of sustainable materials due to the ability to tailor their structure and properties, in contrast to conventional ceramic humidity sensor materials.

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Section: Resultsmentioning

confidence: 99%

Renewable Hybrid Biopolymer/Polyaniline Composites for Humidity Sensing

Anisimov

Evitts

Cree

et al. 2022

ACS Appl. Polym. Mater.

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“…The conductivity behavior of PANI-C was determined using the following equation:

where s is an exponent parameter that is typically equal to unity, ω is the angular frequency, and A is a constant. 3 …”

Section: Step-by-step Methods Detailsmentioning

confidence: 99%

Protocol for fabrication of nanosubstrate embedded with nanogroove topography coated by a layer of nanocomposite for neuronal differentiation

Afsharian,

Mahdavian,

Allahverdi

2024

STAR Protocols

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“…The AC conductivity (σ ac ) of PANI and PANI/KNO composites at RT showed two frequency regions. 32,93,94 The first region is the low-frequency region where the AC conductivity showed nearly constant behavior, whereas the second region is the high-frequency region where the AC conductivity showed rapidly increasing behavior. The increase in conductivity with frequency, particularly in the high-frequency region, corresponds to the behavior observed in the real part of AC conductivity.…”

Section: Ac Conductivity At Room Temperaturementioning

confidence: 99%

“…There are two factors, which are responsible for AC conduction (i) interface charge polarization and (ii) intrinsic electric polarization. 93,97 The first factor exists when an external field applied to the interface between two materials or regions in the material results in charge accumulation. The second factor exists when an external electric field results in the shifting of both positive and negative charges to slightly opposite directions.…”

Section: Ac Conductivity At Room Temperaturementioning

confidence: 99%

Photocatalytic activity of polyaniline‐potassium doped nickel oxide nanocomposites: A comprehensive investigation on multifaceted properties

Bhankhar,

Saini,

Sehrawat

et al. 2024

J of Applied Polymer Sci

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Polyaniline‐potassium doped nickel oxide nanocomposites (PANI/KNO) were efficiently synthesized via an in situ chemical oxidation method, meticulously confirmed by comprehensive x‐ray diffraction, Fourier transformation infrared spectroscopy, energy dispersive x‐ray spectroscopy, selected area electron diffraction, and x‐ray photoelectron spectroscopy analyses. The crystallite size and strain exhibited distinct behaviors, while field emission scanning electron microscopy revealed a blend of irregular spherical shapes and nanofibers, further confirmed by high resolution transmission electron microscopy. These composites exhibited significantly enhanced thermal stability, surpassing PANI by 1.39 times, and showcased a band gap exceeding 3 eV, along with multiple photoluminescence peaks at room temperature (RT). Moreover, their RT AC conductivity experienced a remarkable surge by 4.91 times compared to pure polyaniline. Jonscher's Power Law model and the Havriliak–Negami relaxation model are employed to elucidate the electrical properties of composite materials. The composites displayed nonDebye relaxation behavior with increased conductivity, as observed through impedance analysis, electrical modulus evaluation, and dielectric constant assessment. Additionally, evident superparamagnetic properties and multiple magnetic domains further contributed to their effectiveness. The PANI/KNO composite demonstrated photocatalytic efficiency, achieving over 90% degradation of methylene blue dye across four cycles, thus highlighting its superior photostability. Furthermore, investigations into its response to pH variations and scavenger activity underscored its immense potential for highly effective photocatalytic applications.

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Effect of polyaniline on the structural, conductivity, and dielectric properties of chitosan

Cited by 16 publications

References 86 publications

Renewable Hybrid Biopolymer/Polyaniline Composites for Humidity Sensing

Renewable Hybrid Biopolymer/Polyaniline Composites for Humidity Sensing

Protocol for fabrication of nanosubstrate embedded with nanogroove topography coated by a layer of nanocomposite for neuronal differentiation

Photocatalytic activity of polyaniline‐potassium doped nickel oxide nanocomposites: A comprehensive investigation on multifaceted properties

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