Large Dielectric Constant Enhancement in MXene Percolative Polymer Composites

Shaobo Tu, Qiu Jiang, Xixiang Zhang*, Husam N. Alshareef

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

312 Scopus citations

Abstract

We demonstrate that poly(vinylidene fluoride) (PVDF)-based percolative composites using two-dimensional (2D) MXene nanosheets as fillers exhibit significantly enhanced dielectric permittivity. The poly(vinylidene fluoride-trifluoro-ethylene-chlorofluoroehylene) (P[VDF-TrFE-CFE]) polymer embedded with 2D Ti3C2Tx nanosheets reaches a dielectric permittivity as high as 105 near the percolation limit of about 15.0 wt % MXene loading, which surpasses all previously reported composites made of carbon-based fillers in the same polymer. With up to 10 wt % MXene loading, the dielectric loss of the MXene/P(VDF-TrFE-CFE) composite indicates only an approximately 5-fold increase (from 0.06 to 0.35), while the dielectric constant increased by 25 times over the same composition range. Furthermore, the ratio of permittivity to loss factor of the MXene-polymer composite is superior to that of all previously reported fillers in this same polymer. The dielectric constant enhancement effect is demonstrated to exist in other polymers as well when loaded with MXene. We show that the dielectric constant enhancement is largely due to the charge accumulation caused by the formation of microscopic dipoles at the surfaces between the MXene sheets and the polymer matrix under an external applied electric field.

Original languageEnglish (US)
Pages (from-to)3369-3377
Number of pages9
JournalACS Nano
Volume12
Issue number4
DOIs
StatePublished - Apr 24 2018

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

Keywords

  • MXene nanosheets
  • dielectric permittivities
  • microscopic dipoles
  • percolative composites
  • switching current

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy

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