Microstructure and dielectric properties of sub‐micron hollow sphere (Ba
 0.6
 Sr
 0.4
 )TiO
 3
 /PVDF composites

Guo, Yiting; Zhang, Kena; Meng, Nan; Wu, Wanli; Wang, Yujian; Xu, Jie; Pawlikowska, Emilia; Szafran, M.; Gao, Feng

doi:10.1049/iet-nde.2019.0013

Cited by 14 publications

(3 citation statements)

References 28 publications

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“…The sudden increase in the dielectric permittivity of PVDF-C 3 N 4 composite after 60 °C is likely to be caused by PVDF's softening because at softening temperature, its molecules start to move significantly throughout the crystal region, resulting in relaxations in nanocomposites [46]. Also, the sudden rise in the tangent loss for PVDF-C 3 N 4 at 60 °C results from relaxation processes induced by defects in the PVDF matrix [42].…”

Section: Dielectric Studiesmentioning

confidence: 99%

Preparation of graphitic carbon nitride (g-C₃N₄) for novel dielectric and photocatalytic dye removal applications

et al. 2023

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Recent developments in 2D nanomaterials have greatly expanded their use in engineering applications. Graphitic carbon nitride (g-C3N4) shows a combination of electrical conductivity, sensing and luminescence abilities, biocompatibility, and chemical stability. The present study showcases the effectiveness of g-C3N4 as a photocatalyst for removing various organic molecules from water (such as methylene blue, 4-nitrophenol, and pharmaceutical drugs) and its potential use in dielectric applications when combined with an organic polymer (polyvinylidene fluoride; PVDF). XRD patterns confirmed the formation of g-C3N4 (which is complimented by the UV-Visible and FTIR results) and PVDF-g-C3N4 composite film. SEM-EDS verified the chemical homogeneity of the as-prepared g-C3N4 powder. Maximum photocatalytic degradation was observed for methylene blue dye (96.48%) with a half-life of 24.18 min, whereas the least degradation was detected for hydroxychloroquine (53.10%) with a half-life of 90.12 min after 120 min of UV-visible exposure. 10wt% C3N4 reinforced PVDF thick films exhibited stable dielectric properties at low temperature (below 60°C) as compared to PVDF alone. At 1kHz, the dielectric permittivity and tangent loss of the PVDF-g-C3N4 composites come out to be ~6 and ~0.05, respectively (at room temperature). The AC conductivity and activation energy of the synthesized composite was also studied.

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Section: Dielectric Studiesmentioning

confidence: 99%

Preparation of graphitic carbon nitride (g-C₃N₄) for novel dielectric and photocatalytic dye removal applications

et al. 2023

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“…For instance, several researchers reported high permittivity and low loss values for BST/PVDF functional composite materials upon modifying the surface of BST and adjusting its content in the polymer matrix [28][29][30][31]. Furthermore, the dielectric tunability of these composites was found to be highly influenced by the ceramic volume fraction, the tunability of ceramic phase, shape factor, the phenomenological coefficient ratio of ceramic and polymer (β1 = β2), and the permittivity ratio of ceramic and polymer [32][33][34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Investigation of structure, thermal and dielectric study of Dy_0.05Ba_0.7Sr_0.25TiO₃/polystyrene nanocomposites

et al. 2023

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The present study aims to fabricate ceramic/polymer nanocomposite films for use in energy storage devices. To achieve this, Dy0.05Ba0.7Sr0.25TiO3 (Dy-BST) nanoparticles with a high permittivity, sintered at 1300°C for 3h, were prepared using the conventional solid-state method. Subsequently, different volume fractions of Dy-BST (0, 5, 10, 15, and 20) in nanoscale (8–18 nm), were introduced into the polystyrene matrix to produce nanocomposites with enhanced dielectric properties. The crystal structure, morphology, surface morphology, thermal properties, electrical properties, and breakdown voltage of the prepared composites were investigated using different techniques. XRD study indicated that crystallinity of composites relatively increases with the ceramic content increase. The introduction of Dy-BST into the polymer matrix enhanced the thermal stability as well as limited the thermal degradation of the Dy-BST/PS nanocomposite films. Also, it enhanced the dielectric properties of these composites, i.e. ε' increased from 2.15 to ~10 while tanδ decreased from 0.0015 to 0.0011. Also, it is found to be beneficial to improve the breakdown strength of composite films. Basically, the prepared BST/PS nanocomposite films could be beneficial for energy storage devices, and electrical insulating applications.

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“…Therefore, it is urgent to design and develop new types of PIs with low permittivity. In order to obtain the low-permittivity polymer materials, two effective strategies are generally considered— (1) reducing the molar polarization rate of the material; (2) introducing air into the polymer matrix ( ε air ≈ 1.0) [ 7 , 8 , 9 , 10 , 11 , 12 ]. For example, Zhang et al reported that a kind of PI fabricated by fluorinated polybenzoxazole derived from the benzoxazine monomer possessed the combined excellent properties of facile synthesis, easy processability, and low permittivity [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Low—Permittivity Copolymerized Polyimides with Fluorene Rigid Conjugated Structure

et al. 2021

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As the miniaturization of electronic appliances and microprocessors progresses, low-permittivity interlayer materials are becoming increasingly important for their suppression of electronic crosstalk, signal propagation delay and loss, and so forth. Herein, a kind of copolyimide (CPI) film with a “fluorene” rigid conjugated structure was prepared successfully. By introducing 9,9-Bis(3-fluoro-4-aminophenyl) fluorene as the rigid conjugated structure monomer, a series of CPI films with different molecular weights were fabricated by in situ polymerization, which not only achieved the reduction of permittivity but also maintained excellent thermodynamic stability. Moreover, the hydrophobicity of the CPI film was also improved with the increasing conjugated structure fraction. The lowest permittivity reached 2.53 at 106 Hz, while the thermal decomposition temperature (Td5%) was up to 530 °C, and the tensile strength was ≥ 96 MPa. Thus, the CPI films are potential dielectric materials for microelectronic and insulation applications.

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Microstructure and dielectric properties of sub‐micron hollow sphere (Ba _0.6 Sr _0.4 )TiO ₃ /PVDF composites

Cited by 14 publications

References 28 publications

Preparation of graphitic carbon nitride (g-C₃N₄) for novel dielectric and photocatalytic dye removal applications

Preparation of graphitic carbon nitride (g-C₃N₄) for novel dielectric and photocatalytic dye removal applications

Investigation of structure, thermal and dielectric study of Dy_0.05Ba_0.7Sr_0.25TiO₃/polystyrene nanocomposites

Low—Permittivity Copolymerized Polyimides with Fluorene Rigid Conjugated Structure

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Microstructure and dielectric properties of sub‐micron hollow sphere (Ba 0.6 Sr 0.4 )TiO 3 /PVDF composites

Cited by 14 publications

References 28 publications

Preparation of graphitic carbon nitride (g-C3N4) for novel dielectric and photocatalytic dye removal applications

Preparation of graphitic carbon nitride (g-C3N4) for novel dielectric and photocatalytic dye removal applications

Investigation of structure, thermal and dielectric study of Dy0.05Ba0.7Sr0.25TiO3/polystyrene nanocomposites

Low—Permittivity Copolymerized Polyimides with Fluorene Rigid Conjugated Structure

Contact Info

Product

Resources

About

Microstructure and dielectric properties of sub‐micron hollow sphere (Ba _0.6 Sr _0.4 )TiO ₃ /PVDF composites

Preparation of graphitic carbon nitride (g-C₃N₄) for novel dielectric and photocatalytic dye removal applications

Preparation of graphitic carbon nitride (g-C₃N₄) for novel dielectric and photocatalytic dye removal applications

Investigation of structure, thermal and dielectric study of Dy_0.05Ba_0.7Sr_0.25TiO₃/polystyrene nanocomposites