Introducing a ZnO–PTFE (Polymer) Nanocomposite Varistor via the Cold Sintering Process

Xuetong Zhao, Jing Guo, Ke Wang, Thomas Herisson De Beauvoir, Bo Li, Clive A. Randall

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A ZnO–PTFE nanocomposite is formed from a cold sintering process with volume fractions of PTFE up to 40 vol%. The polymer is distributed along grain boundaries and used to limit current from across adjacent grains, enabling this varistor response, with α ≈ 7 being observed. The nanocomposite structure is verified to have polymer intergranular phase in a thickness range from 2 to 5 nm. The electrical characteristics are made to show nonlinear I–V behavior; the barrier-layer effective permittivity is established through an impedance spectroscopy analysis. The activation energies controlling resistance at the grain boundary is determined to range between 0.2 and 0.76 eV with volume fractions between 0 and 40 vol% PTFE. Under high fields and across a broad temperature ranges, the authors quantified of the non-linear conductions with a variety of voltages, the low field higher temperatures are consistent with a Schottky thermionic emission controlled conduction, and Fowler–Nordheim plots shows the current is transitioned to tunneling controlled. The authors also discuss the possibility of designing new types of nanocomposites with the process indicated here, and also having the possibility of taking advantage of interfacial size effects with thin polymer films between ceramic grains.

Original languageEnglish (US)
Article number1700902
JournalAdvanced Engineering Materials
Volume20
Issue number7
DOIs
StatePublished - Jul 2018

Fingerprint

varistors
Varistors
Nanocomposites
nanocomposites
sintering
Polymers
Sintering
Polytetrafluoroethylene
Polytetrafluoroethylenes
Volume fraction
polymers
Grain boundaries
grain boundaries
Thermionic emission
conduction
thermionic emission
barrier layers
Polymer films
Permittivity
Activation energy

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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title = "Introducing a ZnO–PTFE (Polymer) Nanocomposite Varistor via the Cold Sintering Process",
abstract = "A ZnO–PTFE nanocomposite is formed from a cold sintering process with volume fractions of PTFE up to 40 vol{\%}. The polymer is distributed along grain boundaries and used to limit current from across adjacent grains, enabling this varistor response, with α ≈ 7 being observed. The nanocomposite structure is verified to have polymer intergranular phase in a thickness range from 2 to 5 nm. The electrical characteristics are made to show nonlinear I–V behavior; the barrier-layer effective permittivity is established through an impedance spectroscopy analysis. The activation energies controlling resistance at the grain boundary is determined to range between 0.2 and 0.76 eV with volume fractions between 0 and 40 vol{\%} PTFE. Under high fields and across a broad temperature ranges, the authors quantified of the non-linear conductions with a variety of voltages, the low field higher temperatures are consistent with a Schottky thermionic emission controlled conduction, and Fowler–Nordheim plots shows the current is transitioned to tunneling controlled. The authors also discuss the possibility of designing new types of nanocomposites with the process indicated here, and also having the possibility of taking advantage of interfacial size effects with thin polymer films between ceramic grains.",
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Introducing a ZnO–PTFE (Polymer) Nanocomposite Varistor via the Cold Sintering Process. / Zhao, Xuetong; Guo, Jing; Wang, Ke; Herisson De Beauvoir, Thomas; Li, Bo; Randall, Clive A.

In: Advanced Engineering Materials, Vol. 20, No. 7, 1700902, 07.2018.

Research output: Contribution to journalArticle

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