10.1007/s40094-020-00389-y

The effects of multiwall carbon nanotubes on the electrical characteristics of ZnO-based composites

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  • N. Asaadi1,
  • M. Parhizkar*1,
  • H. Bidadi1,
  • S. Mohammadi Aref1,
  • M. Ghafouri2,
  1. Department of Condensed Matter Physics, Faculty of Physics, University of Tabriz, 29 Bahman Blvd., Imam St., Tabriz, Iran
  2. Department of Physics, Faculty of Physics, Shabestar Branch, Islamic Azad University, Shabestar, Iran

Published in Issue 2023-11-17

How to Cite

1.
Asaadi N, Parhizkar M, Bidadi H, Aref SM, Ghafouri M. The effects of multiwall carbon nanotubes on the electrical characteristics of ZnO-based composites. J Theor Appl phys. 2023 Nov. 17;14(4). Available from: https://oiccpress.com/jtap/article/view/1894
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Abstract

AbstractIn this experimental work, the effects of multiwall carbon nanotubes (MWCNTs) on electrical characteristics of zinc oxideâMWCNTâhigh-density polyethylene composite varistors have been investigated. All the samples were made at the temperature of 130 °C and pressure of 60 MPa by the hot-press method. Results show that increasing zinc oxide content in the mixture increases breakdown voltage up to 170 V, where the highest nonlinear coefficient (αâ~â13) corresponds to the samples with 95 wt% of ZnO. Results with regard to the effects of MWCNT as an additive reveal that increasing its content from 1 to 2.5% in the composites, the breakdown voltage decreases to 50 V, but the highest nonlinear coefficient (~â14) corresponds to the sample with 1.5% of MWCNT content. It is also revealed that, heat treatment of the sample at a constant temperature of 135 °C and different time intervals from 2 to 10 h, the sample with 6 h annealing time shows maximum breakdown voltages (Vbâ=â140 V) with the highest nonlinear coefficient (~â14). Investigation of the potential barrier height of samples shows a complete consistency with the breakdown voltage variations. The results have been justified regarding XRD patterns and SEM micrographs of samples.

Keywords

  • Composite varistor,
  • Multiwall carbon nanotube,
  • Nonlinear coefficient,
  • ZnO
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