Enhanced thermal conductivity and dielectric properties in electrostatic self-assembly 3D pBN@nCNTs fillers loaded in epoxy resin composites

Zhang, Dongli; Liu, Sheng-Nan; Cai, Huiwu; Feng, Qingxiang; Zhong, Shao‐Long; Zha, Jun‐Wei; Dang, Zhi‐Min

doi:10.1016/j.jmat.2020.06.013

Cited by 28 publications

(15 citation statements)

References 44 publications

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“…[16][17][18][19] Thinner dielectric materials with higher working temperatures are the pathway for more electric power applications in the future. [20][21][22][23] Film roughness, thickness variation, surface waviness/wrinkling, and other types of imperfection in the subsequent processes (e.g. metallisation and coating) become more important when the film thickness is decreased.…”

Section: Introductionmentioning

confidence: 99%

A review of surface roughness impact on dielectric film properties

Song

Wang

Tan

2021

IET Nanodielectrics

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The importance of surface roughness with respect to the bulk properties of dielectric materials is often overlooked. Surface roughness or interfaces between different material layers often significantly affects the external properties of thin films. Surface roughness holds its commonalty and critical impact among many materials properties. This review summarises the recent work on the effect of surface roughness on the mechanical, thermal, physical, and dielectric properties of dielectric films. Appropriate roughness favours adhesion, filtration, biological fouling, tribological properties, and magnetic properties. Nevertheless, lower roughness generally benefits the dielectric properties of dielectric materials, with thicknesses ranging from a few nanometres to up to 50 μm. This review discusses surface roughness control and the techniques of measurement as well. It emphasises the importance and characterisation of sample surface roughness for a better understanding of the dielectric phenomenon, mechanisms, and electrical stress test setup for various dielectric films.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Introductionmentioning

confidence: 99%

A review of surface roughness impact on dielectric film properties

Song

Wang

Tan

2021

IET Nanodielectrics

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“…The structures of 3D fillers have a crucial effect on the dielectric properties of polymer composites. Although several types of 3D fillers have been developed [34][35][36][37], three-dimensionally ordered macroporous (3DOM) fillers have not been utilized thus far. Herein, we prepared BT inverse opal (BT_IO) particles with 3DOM structures via a templated sol-gel method and introduced them into PVDF matrix to tailor their dielectric properties.…”

Section: Supplementary Informationmentioning

confidence: 99%

Three-dimensionally ordered macroporous BaTiO3 framework-reinforced polymer composites with improved dielectric properties

Zhang

Tang

2021

SN Appl. Sci.

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Polymer composites with high dielectric constants are highly desired in advanced electronic devices and the modern electrical industry. The dielectric constant of three-dimensional filler-reinforced polymer composites is usually enhanced at the expense of flexibility. Herein, barium titanate inverse opals (BT_IOs) that have three-dimensionally ordered and interconnected macropores are prepared and introduced into a poly (vinylidene fluoride) (PVDF) matrix to tailor their dielectric properties. The composite films with 30 wt% BT_IOs exhibit a dielectric constant of 18.8 at 1 kHz, showing an enhancement of 154% and 35% compared with that of pristine PVDF and their corresponding composites reinforced with barium titanate nanoparticles, respectively. Meanwhile, the dielectric loss is suppressed at 0.088. The BT_IOs/PVDF composite films also maintain good flexibility and can be freely bent. This design of three-dimensionally ordered macroporous filler-reinforced polymer composites with improved dielectric constants and good flexibility presents promising applications of dielectric materials in flexible electronics.

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“…The ion-bulk conduction under AC conditions at low frequency has a similar nonlinear conduction mechanism to that under the DC condition. Moreover, the Maxwell–Wagner interface polarization can be enhanced under a high electric field due to more charge accumulation on the EP/SiCw interfaces . However, the dipole polarization occurs easily under the low electric field, contributing less to the nonlinear conductivity and permittivity.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

Tailoring Electric Field Distortion in High-Voltage Power Modules Utilizing Epoxy Resin/Silicon Carbide Whisker Composites with Field-Dependent Conductivity

Wang

Chen

Huang

et al. 2022

ACS Appl. Electron. Mater.

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This paper reports the performance of an epoxy resin/silicon carbide whisker (EP/SiCw) composite (1–5 wt %) as the field-dependent conductivity (FDC) layer for electric field reduction in the high-voltage power module. The experiments consist of a field emission scanning electron microscope (FESEM), thermal conductivity, Fourier transform infrared (FT-IR) spectroscopy, thermally stimulated discharge current (TSDC), space charge, DC conductivity, and dielectric spectroscopy. The DC conductivity and dielectric spectroscopy are used for DC and AC stationary electric field simulations, respectively. The electric field reduction of EP/SiCw composites in the power module is analyzed, and the void defect in the FDC layer is also identified. The observed percolation threshold of the EP/SiCw composites is 3 wt %, and the DC electric field near the triple point decreases significantly by 74.8% under 10 kV when a 5 wt % EP/SiCw composite is applied for the FDC layer. It was found that the efficient threshold operating frequency of the FDC layer is around 10 kHz. The FDC layer can significantly reduce the electric field under AC voltage below 10 kHz. Although the power loss with the FDC layer increases obviously without the FDC layer, it is still lower than 1 W at 1 MHz, which is negligible for industrial applications. Notably, the void in the FDC layer is identified by the slowly increased dielectric loss with the increase of frequency through dielectric spectroscopy simulation.

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Enhanced thermal conductivity and dielectric properties in electrostatic self-assembly 3D pBN@nCNTs fillers loaded in epoxy resin composites

Cited by 28 publications

References 44 publications

A review of surface roughness impact on dielectric film properties

A review of surface roughness impact on dielectric film properties

Three-dimensionally ordered macroporous BaTiO3 framework-reinforced polymer composites with improved dielectric properties

Tailoring Electric Field Distortion in High-Voltage Power Modules Utilizing Epoxy Resin/Silicon Carbide Whisker Composites with Field-Dependent Conductivity

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