Improved dielectric performance of polyvinylidene fluoride (PVDF) - Carbon dots composites

Aravinda, T.; Rao, Srilatha; Kumbla, Vidhyashree; Pattar, Jayadev

doi:10.1016/j.physe.2022.115589

Cited by 10 publications

(6 citation statements)

References 24 publications

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“…The increase in dielectric permittivity value for PVDF/C 1.5 may be attributed to significant charge carrier blocking at the internal interfaces under the influence of an electric field, known as the Maxwell-Wagner-Sillars effect. [50] Additionally, it can be noted that the addition of carbon results in significant frequency dispersion of dielectric permittivity, confirming interfacial polarization that is not characteristic of pure PVDF. The decrease in dielectric permittivity in PVDF/C 0.5 is likely due to the presence of many polar semi-ionic CÀ F bonds, which act as channels for interfacial screening relaxation.…”

Section: Resultsmentioning

confidence: 88%

“…This effect is particularly noticeable at low frequencies. The increase in dielectric permittivity value for PVDF/C 1.5 may be attributed to significant charge carrier blocking at the internal interfaces under the influence of an electric field, known as the Maxwell‐Wagner‐Sillars effect [50] . Additionally, it can be noted that the addition of carbon results in significant frequency dispersion of dielectric permittivity, confirming interfacial polarization that is not characteristic of pure PVDF.…”

Section: Resultsmentioning

confidence: 94%

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1D/2D Electrospun Polyvinylidene Fluoride Nanofibers/Carbon Flakes Hybrid Nonmetal Polymeric Photo‐ and Piezocatalyst

Orudzhev,

Selimov,

Rabadanova

et al. 2023

ChemistrySelect

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Currently, one of the priority tasks is the development of intelligent materials that are sensitive to stimuli and can be used in catalytic applications for efficient decomposition of organic pollutants. Particularly relevant in this regard is the development of inexpensive non‐metallic hybrid polymer photocatalysts, and the explanation of the mechanism of using light energy in such systems is still the subject of open discussions. In this work, hybrid polymer fiber membranes based on polyvinylidene fluoride (PVDF) with graphite flakes were obtained by electrospinning. The morphology of the obtained samples was investigated using SEM microscopy methods, and their crystalline structure was analysed using XRD, Raman, and FTIR methods. Using RFE spectroscopy, it was shown that the addition of graphite leads to ion‐dipole interaction between the carbon surface and the polymer dipoles, changing the ratio of covalent and semi‐ionic bonds on the surface. The catalytic properties investigated during the decomposition of the organic dye methylene blue (MB) demonstrated high piezocatalytic activity of doped membranes and high photocatalytic activity of PVDF/C0.5. It was established that the photocatalytic activity is due to excitonic excitation.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 94%

1D/2D Electrospun Polyvinylidene Fluoride Nanofibers/Carbon Flakes Hybrid Nonmetal Polymeric Photo‐ and Piezocatalyst

Orudzhev,

Selimov,

Rabadanova

et al. 2023

ChemistrySelect

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show abstract

“…However, the addition of 15% N‐CDs resulted in a reduction in the dielectric constant and conductivity of the cured epoxy. This could be explained by the reason that excessive addition of 15% N‐CDs decreased the crosslinking density of EP, affecting the polarization ability between polymer chains, consequently, the dielectric constant decreased and the dielectric loss increased 49 . The low dielectric performance of epoxy composites held significant importance in addressing various issues such as heat generation and energy consumption in electronic devices.…”

Section: Resultsmentioning

confidence: 99%

“…This could be explained by the reason that excessive addition of 15% N-CDs decreased the crosslinking density of EP, affecting the polarization ability between polymer chains, consequently, the dielectric constant decreased and the dielectric loss increased. 49 The low dielectric performance of epoxy composites held significant importance in addressing various issues such as heat generation and energy consumption in electronic devices. This characteristic opened up possibilities for expanding the application of epoxy-based materials within the electrical and electronic fields.…”

Section: Dielectric Property and Hydrophobicity Of N-cds-ep Compositesmentioning

confidence: 99%

Enhancing the UV resistance and flame retardancy of epoxy resin composites with fluorescent carbon dots

Wang,

Liu,

Wang

et al. 2024

J of Applied Polymer Sci

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Carbon dots (CDs) are a novel class of carbon material which have gained widespread usages owing to their exceptional optical properties, low toxicity, and high biocompatibility. The nitrogen‐doped carbon dots (N‐CDs) using a normal curing agent of 4,4′‐diaminodiphenylmethane as resource was expected to not only have good compatibility with epoxy resin (EP), but also bring luminescent property to EP composites. It was interesting that the N‐CDs‐EP composites with 12.5 wt% addition exhibited a limiting oxygen index value of 31.4% and reached UL‐94 V‐1 grade, indicating a good flame retardancy. Compared with pure EP, the incorporation of N‐CDs formed more residual char and had extra smoke suppression effect. Besides, the N‐CDs‐EP composites exhibited a low transmittance less than 10% for the light wavelength below 490 nm. The N‐CDs contributed to the light shielding capabilities of the N‐CDs‐EP composites, which could effectively shield purple, blue, and cyan light. Furthermore, the mechanical properties including bending strength and impact strength, the dielectric property, and hydrophobicity of N‐CDs‐EP composites were also improved. The simple but effective modification strategy might be expected to be applied in many polymer systems.

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“…% of composites (graphite/PANI) were determined by powder XRD (RIGAKU) functioning with Cu-Kα1 radiation (l = 1.54 A˚) at scan of 3° min -1 and a 2-theta range of 5-80° [24,25]. The PANI doped graphite samples were characterized with FTIR spectroscopy [24]. DC electric conductivity of different wt.…”

Section: Analytical Techniques Used For Characterization Of Graphite/...mentioning

confidence: 99%

Synthesis and electrical properties of Reused-Graphite/Polyaniline composites

Faniband,

Sarvesha chandra,

Sreekanth

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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Polyaniline graphite composites have been synthesized using chemical oxidative polymerization method. The graphite powder has been reused which is obtained by used batteries. XRD patterns of graphite show (002) peak and no impurity peaks. Different wt. % (5, 10, 15, 20) of graphite is used for synthesis of composites and studied their electrical conductivity. XRD patterns of composites show increasing intensity with an increasing graphite content. SEM images show plate-like morphology of graphite whereas granular-morphology for PANI. Composite samples show both plate-like morphology and granular morphology indicating that graphite is embedded in the polymer matrix. Electrical characteristics of composite samples have shown a systematic increase in conductivity with an increase in the graphite concentration. Conductive fillers within the polymer matrix can increase the overall conductivity. Higher filler content provides more conductive pathways for electrons, resulting in enhanced conductivity. The detailed studies of these results are discussed and presented in this paper.

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Improved dielectric performance of polyvinylidene fluoride (PVDF) - Carbon dots composites

Cited by 10 publications

References 24 publications

1D/2D Electrospun Polyvinylidene Fluoride Nanofibers/Carbon Flakes Hybrid Nonmetal Polymeric Photo‐ and Piezocatalyst

1D/2D Electrospun Polyvinylidene Fluoride Nanofibers/Carbon Flakes Hybrid Nonmetal Polymeric Photo‐ and Piezocatalyst

Enhancing the UV resistance and flame retardancy of epoxy resin composites with fluorescent carbon dots

Synthesis and electrical properties of Reused-Graphite/Polyaniline composites

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