Space charge effects on the dielectric response of polymer nanocomposites

Zhong Hui Shen, Jianjun Wang, Xin Zhang, Yuanhua Lin, Ce Wen Nan, Long-qing Chen, Yang Shen

Research output: Contribution to journalArticle

19 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 languageEnglish (US)
Article number092901
JournalApplied Physics Letters
Volume111
Issue number9
DOIs
StatePublished - Aug 28 2017

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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