Modified carbon nanotube composites with high dielectric constant, low dielectric loss and large energy density

Yang, Cheng; Lin, Yuan‐Hua; Chen, Nan

doi:10.1016/j.carbon.2008.12.037

Cited by 297 publications

(202 citation statements)

References 25 publications

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“…A number of special features have been reported on CNT in the literature, such as excitation of localized electronic states resulting in high intrinsic permittivity (Watts et al, 2003).The microwave permittivity is found to exhibit smooth frequency-dependent (Browning, et al, 1998& Sandler, et al, 2003. These results seem to demonstrate the possibility to obtain CNT composites with microwave properties which are more diverse than those obtainable with other types of carbon fillers, e. g., with various types of dispersive dielectrics, with high dielectric but having relative low dielectric loss (Yang, et al, 2009), and tunable dielectric under small bias voltage (Liu, et al, 2008). In addition, the nanoscaled size of CNT in composites may avoid the drawbacks of CF composites, which are limited by the macroscopic size of the fibers for thin structure and component applications.…”

Section: Introductionmentioning

confidence: 77%

Microwave Dielectric Properties of Carbon Nanotube Composites

Liu¹,

Kong²,

Wang³

et al. 2010

Carbon Nanotubes

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Section: Introductionmentioning

confidence: 77%

Microwave Dielectric Properties of Carbon Nanotube Composites

Liu¹,

Kong²,

Wang³

et al. 2010

Carbon Nanotubes

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“…Therefore, a consensus can be carried out that during the curing process, the state of MWCNTs in silicone remains dispersed and re-aggregation does not happen. MWCNTs owning a dielectric constant below 70 in number [12,13] . Considering the balance of effect between time-cost, 8 hours should be the optimal choice just as the conclusion given by the rheology.…”

Section: Methodsmentioning

confidence: 99%

Effect of MWCNTs Dispersion and Loading on the Rheological and Electrical Properties of MWCNTs/Silicone Composite

et al. 2016

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ABSTRACT. The dispersion of multiwalled carbon nanotubes (MWCNTs) in silicone was significantly affected by the method of mixing. In this study, rheology showed that there was an optimal mixing time to get the MWCNTs disperse well and high loading of MWCNTs made the suspension flow difficult. The stability of MWCNTs/silicone suspension was analyzed to estimate the degree of re-aggregation during the curing process. The dispersion and loading of MWCNTs affected significantly electrical properties of MWCNTs/silicone elastomer. With the extension of time stirred, the dielectric constant of 1 wt% MWCNTs/silicone elastomer increased from 17 to 216 while most high dielectric constant composites were only decades in number. The dielectric loss increased exponentially with the loading of MWCNTs, which made the high dielectric constant meaningless.

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“…However, a large dissipation factor is usually not desired in electrical applications. High aspect ratio conductive fillers such as carbon nanotubes [23] and carbon fibers [24] have been used to prepare high dielectric constant composites. The rule of mixtures predicts that 2-dimensional GPLs will increase the dielectric constant at even a lower volume fraction due to their sheet structure and high aspect ratio.…”

Section: Dielectric Constant Of Compositesmentioning

confidence: 99%

Effect of high aspect ratio filler on dielectric properties of polymer composites: a study on barium titanate fibers and graphene platelets

Wang

Nelson

Miao

et al. 2012

IEEE Trans. Dielect. Electr. Insul.

107

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High aspect ratio fillers are predicted to increase the dielectric constant of polymer composites more efficiently than spherical fillers according to the rule of mixtures. Using high aspect ratio fillers is a promising route for creating high dielectric constant, low loss materials at a low filler volume fraction, for use as capacitor and electric field grading materials. In this work, two high aspect ratio fillers were mixed into a polymer matrix, and the dielectric properties of composites were studied. Barium titanate fibers were synthesized by electrospinning a sol-gel, followed by a heat treatment to obtain a perovskite crystal structure. The heat treatment conditions were found to be crucial for obtaining tetragonal barium titanate fibers with high dielectric constant. Graphene platelets were prepared by a thermal shock method, which was found to result in a larger dielectric constant. A combination of barium titanate and graphene platelets yielded the highest dielectric constant when used in a polydimethyl siloxane matrix. The increase in dielectric loss over the pure matrix was small when the volume fraction was below the percolation threshold of graphene platelets. Electric flux density-electric field (D-E) measurements showed a linear dielectric constant in barium titanate filled composites and higher loss when graphene was added. The ac breakdown strength was reduced compared to the neat polymer and was affected by filler aspect ratio. The mechanisms that lead to the observed phenomena are discussed.

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Modified carbon nanotube composites with high dielectric constant, low dielectric loss and large energy density

Cited by 297 publications

References 25 publications

Microwave Dielectric Properties of Carbon Nanotube Composites

Microwave Dielectric Properties of Carbon Nanotube Composites

Effect of MWCNTs Dispersion and Loading on the Rheological and Electrical Properties of MWCNTs/Silicone Composite

Effect of high aspect ratio filler on dielectric properties of polymer composites: a study on barium titanate fibers and graphene platelets

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