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

In this experimental work, the effects of multiwall carbon nanotubes (MWCNTs) on electrical characteristics of zinc oxide–MWCNT–high-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....

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Bibliographic Details
Published in:Journal of theoretical and applied physics 2020-12, Vol.14 (4), p.329-337
Main Authors: Asaadi, N., Parhizkar, M., Bidadi, H., Mohammadi Aref, S., Ghafouri, M.
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Atomic
Breakdown
Coefficients
Composite materials
Condensed Matter Physics
Electric potential
Electronic devices
Heat treatment
High density polyethylenes
Medical and Radiation Physics
Molecular
Multi wall carbon nanotubes
Nanoscale Science and Technology
Optical and Plasma Physics
Photomicrographs
Physics
Physics and Astronomy
Potential barriers
Varistors
Voltage
Zinc oxide
Zinc oxides
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Summary:In this experimental work, the effects of multiwall carbon nanotubes (MWCNTs) on electrical characteristics of zinc oxide–MWCNT–high-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 ( α  ~ 13) 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 (~ 14) 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 ( V b  = 140 V) with the highest nonlinear coefficient (~ 14). 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.
ISSN:2251-7227
2251-7235
DOI:10.1007/s40094-020-00389-y