Broadband dielectric behavior of the multiwall carbon nanotube-bismuth silicate glass-nanocomposites

Haldar, Toton; Kumar, Vinod

doi:10.1016/j.jallcom.2018.09.053

Cited by 15 publications

(3 citation statements)

References 98 publications

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“…The dielectric properties of polymer nanocomposites are related to the movement of free charge carriers and the surface polarization between polymer matrix and nanofillers. 41 The curves of real permittivity (ε′), imaginary permittivity (ε″), and dielectric loss tangent (tan δ) with frequency for (a) PANI and BaFe 12 O 19 /PANI nanocomposites with BaFe 12 O 19 loading of (b) 10, (c) 20, (d) 30, and (e) 40 wt %, calculated by the formulas displayed in part S5, are shown in Figure 3A, Figure S5, and Figure 3B, respectively. In Figure 3A, it is observed that with rising frequency ε′ is increased in the frequency range of 1−100 kHz, and after that, the ε′ tends to reach equilibrium with further increasing frequency.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Electrical Transport in Polyaniline–Barium Ferrite Nanocomposites with Negative Giant Magnetoresistance

et al. 2020

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The barium ferrite/polyaniline (BaFe12O19/PANI) nanocomposites with room temperature negative giant magnetoresistance (GMR) are fabricated by the surface-initiated polymerization (SIP) method. The maximum negative GMR value is −7.1% in BaFe12O19/PANI nanocomposites with a BaFe12O19 loading of 20 wt % at a magnetic field of 9 T. The electrical transport mechanism of these samples is investigated by thermally activated transport (TAT) model at the high temperature range (180–290 K) and Mott variable range hopping (VRH) mechanism at the low temperature range (50–180 K). The results reveal that the electrical transport of pure PANI and BaFe12O19/PANI nanocomposites obeys the 3-D VRH mechanism. The estimated activation energy (E) (related to the energy required for charge carrier hopping process) for pure PANI and BaFe12O19/PANI nanocomposites with a BaFe12O19 loading of 10, 20, 30, and 40 wt % is calculated to be 38.5, 47.0, 52.1, 53.8, and 66.8 meV, respectively, according to the TAT model. With the aim of explaining the negative GMR phenomenon in BaFe12O19/PANI nanocomposites, the forward interference model is introduced, demonstrating the localized length of carriers varies with the applied magnetic field.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Electrical Transport in Polyaniline–Barium Ferrite Nanocomposites with Negative Giant Magnetoresistance

et al. 2020

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“…Selecting glass as the matrix, T. Haldar et al synthesized multi-wall CNT-bismuth silicate glass (MWCNT-BS) nanocomposites via a solid-state reaction. 64 They also prepared Bi 2 O 3 -SiO 2 /MWCNT glass nanocomposites similarly, and observed negative permittivity as well. 65 Due to its large aspect ratio, the negative permittivity can be adjusted effectively by changing the content and distribution of CNTs.…”

Section: Composition Regulation Strategy Based On Carbon Type Content...mentioning

confidence: 93%

Strategies for the effective design and regulation of carbon-based metacomposites: a review

Li,

Guo,

Sun

et al. 2024

J. Mater. Chem. C

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“…Among the family of silicate materials, nontoxic bismuth silicate has various properties such as luminescent, electrical, optical, and photocatalytic properties. , Notably, the photocatalytic activity of bismuth silicate is limited by the recombination of photogenerated electron–hole pairs. Alternatively, an S-scheme heterojunction composed of two n-type semiconductors conducive to inhibiting photogenerated carrier recombination is proposed .…”

Section: Introductionmentioning

confidence: 99%

Construction of 2D Bismuth Silicate Heterojunctions from Natural Mineral toward Cost-Effective Photocatalytic Reduction of CO₂

Liu

Chu

Shi

et al. 2022

Ind. Eng. Chem. Res.

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Photocatalytic reduction of carbon dioxide to chemical fuels is an attractive route to generate renewable energy and curtail the green house effect. However, it remains a great challenge to explore cost-effective photocatalysts using natural and readily available clay minerals. In this work, one-dimensional natural palygorskite (Pal) is treated with acid to remove most of the metal ions from the silica framework, and bismuth ions are incorporated to grow two-dimensional (2D) bismuth silicate (Bi 12 SiO 20 ) nanosheet under a microwave-hydrothermal process. Excess Bi ions generate bismuth oxide (BiO 2−x ) nanoparticles that respond to nearinfrared (NIR) light and coprecipitate on the surface of Bi 12 SiO 20 , which forms a well-defined S-scheme Bi 12 SiO 20 /BiO 2−x heterojunction facilitating the charge transfer and maintaining high redox potentials. The abundant active sites on the 2D Bi 12 SiO 20 sheet and the oxygen vacancies in BiO 2−x particles are found to favor the cooperative activation and adsorption of CO 2 . The influence of various amounts of BiO 2−x on CO 2 reduction performance is explored. Bi 12 SiO 20 /BiO 2−x -30 wt % shows the best photocatalytic reaction rate at 31.16 μmol•g −1 •h −1 for CH 3 OH formation during sunlight irradiation. In NIR light, the Bi 12 SiO 20 / BiO 2−x -30 wt % even achieves a CH 3 OH generation rate of 17.1 μmol•g −1 •h −1 . The current study potentially provides a sustainable approach for CO 2 conversion.

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Broadband dielectric behavior of the multiwall carbon nanotube-bismuth silicate glass-nanocomposites

Cited by 15 publications

References 98 publications

Electrical Transport in Polyaniline–Barium Ferrite Nanocomposites with Negative Giant Magnetoresistance

Electrical Transport in Polyaniline–Barium Ferrite Nanocomposites with Negative Giant Magnetoresistance

Strategies for the effective design and regulation of carbon-based metacomposites: a review

Construction of 2D Bismuth Silicate Heterojunctions from Natural Mineral toward Cost-Effective Photocatalytic Reduction of CO₂

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Broadband dielectric behavior of the multiwall carbon nanotube-bismuth silicate glass-nanocomposites

Cited by 15 publications

References 98 publications

Electrical Transport in Polyaniline–Barium Ferrite Nanocomposites with Negative Giant Magnetoresistance

Electrical Transport in Polyaniline–Barium Ferrite Nanocomposites with Negative Giant Magnetoresistance

Strategies for the effective design and regulation of carbon-based metacomposites: a review

Construction of 2D Bismuth Silicate Heterojunctions from Natural Mineral toward Cost-Effective Photocatalytic Reduction of CO2

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Product

Resources

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Construction of 2D Bismuth Silicate Heterojunctions from Natural Mineral toward Cost-Effective Photocatalytic Reduction of CO₂