Space charge effects on the dielectric response of polymer nanocomposites

Zhong Hui Shen; Jian Jun Wang; Xin Zhang; Yuanhua Lin; Ce Wen Nan; Long Qing Chen; Yang Shen

doi:10.1063/1.4991079

Space charge effects on the dielectric response of polymer nanocomposites

Zhong Hui Shen, Jian Jun Wang, Xin Zhang, Yuanhua Lin, Ce Wen Nan, Long Qing Chen, Yang Shen

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34 Scopus citations

Abstract

Adding high-κ ceramic nanoparticles into polymers is a general strategy to improve the performances in energy storage. Classic effective medium theories may fail to predict the effective permittivity in polymer nanocomposites wherein the space charge effects are important. In this work, a computational model is developed to understand the space charge effects on the frequency-dependent dielectric properties including the real permittivity and the loss for polymer nanocomposites with both randomly distributed and aggregated nanoparticle fillers. It is found that the real permittivity of the SrTiO₃/polyethylene (12% SrTiO₃ in volume fraction) nanocomposite can be increased to as high as 60 when there is nanoparticle aggregation and the ion concentration in the bulk polymer is around 10¹⁶ cm^-3. This model can be employed to quantitatively predict the frequency-dependent dielectric properties for polymer nanocomposites with arbitrary microstructures.

Original language	English (US)
Article number	092901
Journal	Applied Physics Letters
Volume	111
Issue number	9
DOIs	https://doi.org/10.1063/1.4991079
State	Published - Aug 28 2017

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.4991079

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title = "Space charge effects on the dielectric response of polymer nanocomposites",

abstract = "Adding high-κ ceramic nanoparticles into polymers is a general strategy to improve the performances in energy storage. Classic effective medium theories may fail to predict the effective permittivity in polymer nanocomposites wherein the space charge effects are important. In this work, a computational model is developed to understand the space charge effects on the frequency-dependent dielectric properties including the real permittivity and the loss for polymer nanocomposites with both randomly distributed and aggregated nanoparticle fillers. It is found that the real permittivity of the SrTiO3/polyethylene (12% SrTiO3 in volume fraction) nanocomposite can be increased to as high as 60 when there is nanoparticle aggregation and the ion concentration in the bulk polymer is around 1016 cm-3. This model can be employed to quantitatively predict the frequency-dependent dielectric properties for polymer nanocomposites with arbitrary microstructures.",

author = "Shen, {Zhong Hui} and Wang, {Jian Jun} and Xin Zhang and Yuanhua Lin and Nan, {Ce Wen} and Chen, {Long Qing} and Yang Shen",

note = "Funding Information: This work was supported by the NSF of China (Grant Nos. 51625202, 51532003, and 51572141) (Z.-H.S. and L.-Q.C.), the National Basic Research Program of China (Grant No. 2015CB654603) (Y.S. and C.-W.N.), and the Air Force Office of Scientific Research (AFOSR) (Grant No. FA9550-14-1-0264) (J.-J.W. and L.-Q.C.). Publisher Copyright: {\textcopyright} 2017 Author(s).",

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doi = "10.1063/1.4991079",

language = "English (US)",

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T1 - Space charge effects on the dielectric response of polymer nanocomposites

AU - Shen, Zhong Hui

AU - Wang, Jian Jun

AU - Zhang, Xin

AU - Lin, Yuanhua

AU - Nan, Ce Wen

AU - Chen, Long Qing

AU - Shen, Yang

N1 - Funding Information: This work was supported by the NSF of China (Grant Nos. 51625202, 51532003, and 51572141) (Z.-H.S. and L.-Q.C.), the National Basic Research Program of China (Grant No. 2015CB654603) (Y.S. and C.-W.N.), and the Air Force Office of Scientific Research (AFOSR) (Grant No. FA9550-14-1-0264) (J.-J.W. and L.-Q.C.). Publisher Copyright: © 2017 Author(s).

PY - 2017/8/28

Y1 - 2017/8/28

N2 - Adding high-κ ceramic nanoparticles into polymers is a general strategy to improve the performances in energy storage. Classic effective medium theories may fail to predict the effective permittivity in polymer nanocomposites wherein the space charge effects are important. In this work, a computational model is developed to understand the space charge effects on the frequency-dependent dielectric properties including the real permittivity and the loss for polymer nanocomposites with both randomly distributed and aggregated nanoparticle fillers. It is found that the real permittivity of the SrTiO3/polyethylene (12% SrTiO3 in volume fraction) nanocomposite can be increased to as high as 60 when there is nanoparticle aggregation and the ion concentration in the bulk polymer is around 1016 cm-3. This model can be employed to quantitatively predict the frequency-dependent dielectric properties for polymer nanocomposites with arbitrary microstructures.

AB - Adding high-κ ceramic nanoparticles into polymers is a general strategy to improve the performances in energy storage. Classic effective medium theories may fail to predict the effective permittivity in polymer nanocomposites wherein the space charge effects are important. In this work, a computational model is developed to understand the space charge effects on the frequency-dependent dielectric properties including the real permittivity and the loss for polymer nanocomposites with both randomly distributed and aggregated nanoparticle fillers. It is found that the real permittivity of the SrTiO3/polyethylene (12% SrTiO3 in volume fraction) nanocomposite can be increased to as high as 60 when there is nanoparticle aggregation and the ion concentration in the bulk polymer is around 1016 cm-3. This model can be employed to quantitatively predict the frequency-dependent dielectric properties for polymer nanocomposites with arbitrary microstructures.

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Space charge effects on the dielectric response of polymer nanocomposites

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