Structural, electrical and microwave properties of conducting polypyrrole thin films: effect of oxidant

Velhal, Ninad B.; Kulkarni, Gopal; Patil, N. D.; Puri, Vijaya

doi:10.1088/2053-1591/aadaf7

Cited by 22 publications

(11 citation statements)

References 37 publications

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“…The band observed at 780 cm −1 is attributed to CH stretching 24 . The sharp absorption peaks observed at 1558 and 1472 cm −1 correspond to the stretching vibrations of CC and CN in PPy, respectively 17 . The peak appearing at 1178 cm −1 corresponds to the breathing vibration of the pyrrole ring 25,26 .…”

Section: Resultsmentioning

confidence: 97%

“…The DC electrical conductivity of the samples was measured at room temperature using a digital multimeter at various monomer concentrations of pyrrole, using the two‐probe method. The DC conductivity was calculated using Equation 17 :

ρ = \frac{RA}{l}

where ρ is the resistivity of the sample, R is the resistance, A is the area, and l is the length of the sample. The thickness of the PPy samples was measured using a digital microbalance.…”

Section: Methodsmentioning

confidence: 99%

“…The DC electrical conductivity of the samples was measured at room temperature using a digital multimeter at various monomer concentrations of pyrrole, using the two-probe method. The DC conductivity was calculated using Equation 1 17 :…”

Section: Characterizationmentioning

confidence: 99%

“…These are the characteristic peaks of PPy and occur due to scattering from PPy chains at the interplanar spacing. 17…”

Section: Xrd Analysismentioning

confidence: 99%

“…24 The sharp absorption peaks observed at 1558 and 1472 cm −1 correspond to the stretching vibrations of C C and C N in PPy, respectively. 17 The peak appearing at 1178 cm −1 corresponds to the breathing vibration of the pyrrole ring. 25,26 The bands observed at 1042 cm −1 are attributed to the N H in-plane deformation vibration.…”

Section: Fourier Transform Infrared Studiesmentioning

confidence: 99%

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Facile synthesis of coral cauliflower‐like polypyrrole hemispheres toward screening electromagnetic interference pollution

Kulkarni

Kandesar

Velhal

et al. 2021

J of Applied Polymer Sci

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In this study, coral cauliflower‐like polypyrrole (PPy) hemispheres are synthesized on an alumina substrate via a simple chemical oxidative polymerization route. The stony coral‐like morphology of PPy hemispheres acts as a conducting trap in absorbing electromagnetic (EM) radiation via multiple internal reflections. A PPy thin film deposited at 0.2 M pyrrole concentration shows a minimum reflection loss (RL) of −30.80 dB (99.9% microwave absorption) at the frequency of 14.2 GHz, and the highest total shielding effectiveness achieved is −18.3 dB at 16.8 GHz at 4.38 μm film thickness. The thin films exhibit excellent microwave absorption ability at low thicknesses, and the effective absorption bandwidth (RL < –10 dB) attains a high value of 2.2 GHz in the frequency range of 13–15.2 GHz. These findings can help researchers to enhance the EM wave absorption characteristics in a broad frequency region using lightweight intrinsically conducting polymers.

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Section: Resultsmentioning

confidence: 97%

ρ = \frac{RA}{l}

where ρ is the resistivity of the sample, R is the resistance, A is the area, and l is the length of the sample. The thickness of the PPy samples was measured using a digital microbalance.…”

Section: Methodsmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

“…These are the characteristic peaks of PPy and occur due to scattering from PPy chains at the interplanar spacing. 17…”

Section: Xrd Analysismentioning

confidence: 99%

Section: Fourier Transform Infrared Studiesmentioning

confidence: 99%

See 3 more Smart Citations

Facile synthesis of coral cauliflower‐like polypyrrole hemispheres toward screening electromagnetic interference pollution

Kulkarni

Kandesar

Velhal

et al. 2021

J of Applied Polymer Sci

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Synthesis, characterization, and electromagnetic properties of polypyrrole–barium hexaferrite composites for EMI shielding applications

et al. 2023

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The purpose of this study was to evaluate the electromagnetic (EM) properties of hybrid materials made from polypyrrole (PPy) and barium hexaferrite (HF) for possible use in electromagnetic interference (EMI) shielding applications. X-ray diffraction and Fourier-transform infrared spectroscopy methods were used to confirm the presence of PPy and HF phases inside the hybrid structure. A scanning electron microscope analysis revealed that the HF particles were evenly dispersed throughout the PPy structure. The composites’ dielectric and magnetic attributes were evaluated across a spectrum of frequencies, with the highest values observed in the PPy specimen. Adding HF to the PPy matrix altered the dielectric and magnetic properties of the composite, with the percentage of HF in the composite influencing its dominance over these properties. It was determined that a 25% HF content produced the most stable and efficient composite for absorbing EM waves in the X-band. This study demonstrates the potential of conductive polymer composites for EMI shielding applications, with advantages, such as improved EMI shielding, lightweight, flexibility, corrosion resistance, and tailored properties. The novelty lies in optimizing the composition of the PPy/HF composite and the characterization of its EM properties, providing insights into the design of more efficient EMI shielding materials.

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Ba-M+Y (Ba4−XCo2+XFe36O60) complex hexaferrite: structural, electrical, magnetic, and enhanced microwave absorbing properties over 8–18 GHz frequency

Velhal

Kashid

Kulkarni

et al. 2021

J Mater Sci: Mater Electron

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Structural, electrical and microwave properties of conducting polypyrrole thin films: effect of oxidant

Cited by 22 publications

References 37 publications

Facile synthesis of coral cauliflower‐like polypyrrole hemispheres toward screening electromagnetic interference pollution

Facile synthesis of coral cauliflower‐like polypyrrole hemispheres toward screening electromagnetic interference pollution

Synthesis, characterization, and electromagnetic properties of polypyrrole–barium hexaferrite composites for EMI shielding applications

Ba-M+Y (Ba4−XCo2+XFe36O60) complex hexaferrite: structural, electrical, magnetic, and enhanced microwave absorbing properties over 8–18 GHz frequency

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