Short-term breakdown and long-term failure in nanodielectrics: a review

Li, Shengtao; Yin, Gen; Chen, G; Li, Jianying; Bai, Suna; Zhong, Lisheng; Zhang, Yunxa; Liu, Qingquan

doi:10.1109/tdei.2010.5595554

Cited by 291 publications

(186 citation statements)

References 74 publications

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“…In another study on electrical treeing [9], tree growth was suppressed, provided the nanocomposite was free of agglomerations, since these can serve as regions of locally high permittivity. Other authors [10] identify good nanoparticle dispersion as being a key prerequisite for enhanced electrical performance of nanocomposites. Over a wide range of material formulations, improved performance was reported for nanocomposites with…”

Section: Introductionmentioning

confidence: 99%

The Effects of Water on the Dielectric Properties of Aluminum-Based Nanocomposites

Hosier¹,

Praeger²,

Vaughan

et al. 2017

IEEE Trans. Nanotechnology

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Abstract-A series of polyethylene nanocomposites was prepared utilizing aluminum nitride or alumina nano-powders with comparable morphologies. These were subsequently subjected to different conditioning regimes, namely prolonged storage in vacuum, the ambient laboratory environment or in water. The effect of filler loading and conditioning (i.e. water content) on their morphological and dielectric properties was then examined. Measurements indicated that, in the case of aluminum nitride nanocomposites, none of the conditioning regimes led to significant absorption of water and, as such, neither the dielectric properties nor the DC conductivity varied. Conversely, the alumina nanocomposites were prone to the absorption of an appreciable mass of water, which resulted in them displaying a broad dielectric relaxation, which shifted to higher frequencies, and a higher DC electrical conductivity. We ascribe these different effects to the interfacial surface chemistry present in each system and, in particular, the propensity for hydrogen bonding with water molecules diffusing through the host matrix. Technologically, the use of nanocomposites based upon systems such as aluminum nitride, in place of the commonly used metal oxides (alumina, silica, etc.), eliminates variations in dielectric properties due to absorption of environmental water without resorting to the adoption of techniques such as surface functionalization or calcination in an attempt to render nanoparticle surface chemistry hydrophobic.

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Section: Introductionmentioning

confidence: 99%

The Effects of Water on the Dielectric Properties of Aluminum-Based Nanocomposites

Hosier¹,

Praeger²,

Vaughan

et al. 2017

IEEE Trans. Nanotechnology

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“…It has also been found that the related electrical performance, surface flashover, and breakdown deteriorate for nanodielectrics with high concentrations. 3,4,8,9 At present, the exact mechanisms of charge transport in nanodielectrics are not detailed, and the observed experiment phenomenon of charge conduction in nanodielectrics with high loading concentrations has never been fully explained.…”

mentioning

confidence: 99%

Charge transport model in nanodielectric composites based on quantum tunneling mechanism and dual-level traps

2016

Applied Physics Letters

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Charge transport properties in nanodielectrics present different tendencies for different loading concentrations. The exact mechanisms that are responsible for charge transport in nanodielectrics are not detailed, especially for high loading concentration. A charge transport model in nanodielectrics has been proposed based on quantum tunneling mechanism and dual-level traps. In the model, the thermally assisted hopping (TAH) process for the shallow traps and the tunnelling process for the deep traps are considered. For different loading concentrations, the dominant charge transport mechanisms are different. The quantum tunneling mechanism plays a major role in determining the charge conduction in nanodielectrics with high loading concentrations. While for low loading concentrations, the thermal hopping mechanism will dominate the charge conduction process. The model can explain the observed conductivity property in nanodielectrics with different loading concentrations.

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“…Previous research work has indicated that this new conduction mechanism could 2 Journal of Nanotechnology be associated with the electromechanical compression of the polymer and polarization mode. It is known that the morphology of a polymer can be modified by nanofillers (e.g., nanoparticles, nanowires, and nanolayers), due to the large interface interaction (surface to volume ratio) [9], so that the mechanical, thermal, and electrical properties of the polymer could be affected significantly by the introduction of nanofillers [10,11]. Here, we report evidence for the presence of such solitonlike ultra fast space charge packets in epoxy-based nanocomposites.…”

Section: Introductionmentioning

confidence: 73%

A New Ultra Fast Conduction Mechanism in Insulating Polymer Nanocomposites

Montanari

Fabiani

et al. 2011

Journal of Nanotechnology

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A brand new phenomenon, namely, electrical conduction via soliton-like ultra fast space charge pulses, recently identified in unfilled cross-linked polyethylene, is shown for the first time to occur in insulating polymer nanocomposites and its characteristics correlated with the electromechanical properties of nanostructured materials. These charge pulses are observed to cross the insulation under low electrical field in epoxy-based nanocomposites containing nanosilica particles with relative weights of 1%, 5%, 10%, and 20% at speeds orders of magnitude higher than those expected for carriers in insulating polymers. The characteristics of mobility, magnitude and repetition rate for both positive and negative charge pulses are studied in relation to nanofiller concentration. The results show that the ultra fast charge pulses (packets) are affected significantly by the concentration of nanoparticles. An explanation is presented in terms of a new conduction mechanism where the mechanical properties of the polymer and movement of polymer chains play an important role in the injection and transport of charge in the form of pulses. Here, the charge transport is not controlled by traps. Instead, it is driven by the contribution of polarization and the resultant electromechanical compression, which is substantially affected by the introduction of nanoparticles into the base polymer.

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Short-term breakdown and long-term failure in nanodielectrics: a review

Cited by 291 publications

References 74 publications

The Effects of Water on the Dielectric Properties of Aluminum-Based Nanocomposites

The Effects of Water on the Dielectric Properties of Aluminum-Based Nanocomposites

Charge transport model in nanodielectric composites based on quantum tunneling mechanism and dual-level traps

A New Ultra Fast Conduction Mechanism in Insulating Polymer Nanocomposites

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