High dielectric response of 2D-polyaniline nanoflake based epoxy nanocomposites

Wan, Meher; Srivastava, Anoop Kumar; Dhawan, Punit Kumar; Yadav, Raja Ram; Sant, Sudhindra B.; Kripal, Ram; Lee, Jihoon

doi:10.1039/c5ra05660h

Cited by 13 publications

(6 citation statements)

References 35 publications

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“…AC conductivity shows a steadily increasing behaviour at lower filler concentration which is pure dielectric response. At higher concentration, the behaviour resembles UDR wherein there is a plateau in the low-frequency range and exponential rise in the high-frequency range [26][27][28]. According to UDR,…”

Section: Variation Of Ac Conductivity With Frequencymentioning

confidence: 96%

Determination of electrical percolation threshold of carbon nanotube‐based epoxy nanocomposites and its experimental validation

Mohan

Kumar

Sunitha

et al. 2019

IET Science, Measurement & Technology

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Section: Variation Of Ac Conductivity With Frequencymentioning

confidence: 96%

Determination of electrical percolation threshold of carbon nanotube‐based epoxy nanocomposites and its experimental validation

Mohan

Kumar

Sunitha

et al. 2019

IET Science, Measurement & Technology

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“…Figure a,b shows the dielectric constant and tangent loss values of PANI composites synthesized at varied concentrations of activated carbon. The dielectric constant values are high in the lower-frequency region because of the Maxwell–Wagner–Sillars effect, and thereafter, it decreases sharply with increasing frequency due to the dielectric relaxation phenomenon. − The maximum dielectric constant value of 39 670 is achieved for ternary doped PANI–3% AC composite, which may be due to various supporting factors like (1) the presence of binary transition metals Cu and Fe in the PANI matrix resulting in more charge delocalization, (2) the ordered growth of ternary doped PANI on highly stable activated carbon surface, which prevents agglomeration tendency, (3) the improvement of space charge densities and charge traps in the composite via highly ordered arrangement (supported by XRD), and (4) the flakelike morphology of the composite helps to make better interaction with the dopants and thereby carries the charges more effectively, enhancing the dielectric constant value owing to the good surface-to-volume ratio . But with increasing concentration of activated carbon from 3 to 10%, the value of dielectric constant decreases from 39 670 to 7978.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Electrochemical Performance of a Hybrid Supercapacitive Material Based on Ternary Doped Polyaniline/Activated Carbon Composite

Chonat

Palatty

2020

Energy Fuels

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A facile strategy for synthesizing a highly performing hybrid supercapacitor electrode material by combining ternary doped (binary transition metals in combination with an inorganic acid) polyaniline (PANI) with cetyl trimethyl ammonium bromide (CTAB) surfactant-wrapped environment-friendly activated carbon (AC) is reported. The composites were fully characterized and exhibited an excellent specific capacitance of 1250 F/g with a significantly beneficial cyclic stability (87% capability following 1000 cycles). This robustly architectured hybrid composite material further exhibited 85.069 Wh/kg energy density and 1049.991 W/kg output power. Furthermore, the material displayed superior dielectric properties with good crystallinity. The enhanced electrochemical performance achieved for the above hybrid composite is attributed to the structural advantage of its flaky morphology and the effective utilization of good surface span, conductivity, and stability of carbonaceous material in favor of the strong pseudocapacitance of ternary doped polyaniline. All of these results demonstrate that the hybrid composite can be ideal for supercapacitor applications.

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“…The prepared materials demonstrate the applicability within a certain range of frequency, which may be expected from a polymer composite. At high frequency (viz., log 10 (ω) ∼ 10 7 Hz), the nonmonotonic behavior is attributed to the resonance effect, which arises due to the presence of polar groups of polymeric chains, contributing toward the electric field induced dipole polarization . To estimate the total conductivity (viz., dc), we have measured the I – V characteristics (Figure d) of all the samples.…”

Section: Resultsmentioning

confidence: 99%

Mixed Surfactant-Mediated Synthesis of Hierarchical PANI Nanorods for an Enzymatic Glucose Biosensor

Palsaniya

Nemade

Dasmahapatra

2019

ACS Appl. Polym. Mater.

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The hierarchical nanoscale structure plays a crucial role in achieving excellent property, which can successfully be used in preparing tailor-made materials for sensing applications. These hierarchical nanostructures can successfully be prepared with the help of structure directing agents (SDAs). In the present work, we report the preparation of polyaniline (PANI) nanorods in the presence of anionic (sodium dodecyl sulfate, SDS) and nonionic surfactant (pluronic F127) as the SDAs. We prepare a series of ternary composites with a varying ratio of PANI and F127 for a given amount of SDS. The SDS and F127 play a pivotal role as structure directing agents (SDAs) in delivering a hierarchical nanostructure of PANI. Detailed characterization reveals that the in situ polymerization of PANI ensures the formation of the well-dispersed composite. The amphiphilic character of F127 facilitates the formation of a core–shell micellar structure, which in turn facilitates the polymerization of PANI in the core region. We have observed a composition-dependent structure formation of the ternary composites. With increasing the amount of F127, the composite shows higher crystallinity (viz. less porosity) as measured by XRD and microscopy imaging. Among all the prepared composites, the one with an 1:1 ratio of PANI and F127 exhibits less porosity (viz., high crystallinity) as measured by the BET surface area measurement. The XRD analysis does not show a sharp peak, which signifies that the material possesses a polycrystalline structure, as revealed by HRTEM analysis. The polycrystalline nature of the nanorods provides the highest thermal stability, contributes significantly toward the enhanced electrochemical activity, and thus, can successfully be used in sensing applications. The 1:1 material exhibits remarkably high glucose sensitivity (∼486 μA/cm2 mM) over the other ternary composites under amperometric measurements. The sensor shows an excellent electrochemical performance within a range of 5–50 mM with a lower detection limit of ∼4 μM.

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High dielectric response of 2D-polyaniline nanoflake based epoxy nanocomposites

Abstract: Nanocomposites of two dimensional nanoflake-like polyaniline fillers reinforced in an epoxy matrix have been synthesised and their dielectric properties have been investigated.

Cited by 13 publications

References 35 publications

Determination of electrical percolation threshold of carbon nanotube‐based epoxy nanocomposites and its experimental validation

Determination of electrical percolation threshold of carbon nanotube‐based epoxy nanocomposites and its experimental validation

Enhanced Electrochemical Performance of a Hybrid Supercapacitive Material Based on Ternary Doped Polyaniline/Activated Carbon Composite

Mixed Surfactant-Mediated Synthesis of Hierarchical PANI Nanorods for an Enzymatic Glucose Biosensor

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