The effects of multiwall carbon nanotubes on the electrical characteristics of ZnO-based composites
- سال انتشار: 1399
- محل انتشار: فصلنامه فیزیک تئوری و کاربردی، دوره: 14، شماره: 4
- کد COI اختصاصی: JR_JTAP-14-4_004
- زبان مقاله: انگلیسی
- تعداد مشاهده: 165
نویسندگان
Department of Condensed Matter Physics, Faculty of Physics, University of Tabriz
Department of Condensed Matter Physics, Faculty of Physics, University of Tabriz
Department of Condensed Matter Physics, Faculty of Physics, University of Tabriz
Department of Condensed Matter Physics, Faculty of Physics, University of Tabriz
Department of Physics, Faculty of Physics, Shabestar Branch, Islamic Azad University
چکیده
AbstractIn 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 ۱۳۰ °C and pressure of ۶۰ MPa by the hot-press method. Results show that increasing zinc oxide content in the mixture increases breakdown voltage up to ۱۷۰ V, where the highest nonlinear coefficient (α ~ ۱۳) corresponds to the samples with ۹۵ wt% of ZnO. Results with regard to the effects of MWCNT as an additive reveal that increasing its content from ۱ to ۲.۵% in the composites, the breakdown voltage decreases to ۵۰ V, but the highest nonlinear coefficient (~ ۱۴) corresponds to the sample with ۱.۵% of MWCNT content. It is also revealed that, heat treatment of the sample at a constant temperature of ۱۳۵ °C and different time intervals from ۲ to ۱۰ h, the sample with ۶ h annealing time shows maximum breakdown voltages (Vb = ۱۴۰ V) with the highest nonlinear coefficient (~ ۱۴). 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.کلیدواژه ها
Multiwall carbon nanotube, ZnO, Composite varistor, Nonlinear coefficientاطلاعات بیشتر در مورد COI
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