材料科学
结晶度
纳米复合材料
低密度聚乙烯
电阻率和电导率
电介质
纳米颗粒
聚乙烯
结晶
分析化学(期刊)
复合材料
化学工程
纳米技术
化学
光电子学
电气工程
有机化学
工程类
作者
Weiwang Wang,Daomin Min,Shengtao Li
出处
期刊:IEEE Transactions on Dielectrics and Electrical Insulation
[Institute of Electrical and Electronics Engineers]
日期:2016-02-01
卷期号:23 (1): 564-572
被引量:176
标识
DOI:10.1109/tdei.2015.004823
摘要
Due to the variation of charge transport characteristics by introduction of nanostructured filler, the conduction and dielectric breakdown properties of nanodielectrics are poorly understood. This work studies on the effect of deep trap on the dc conduction and breakdown properties of nanodielectrics. X-ray diffraction technique is conducted to study the crystallization behavior of LDPE/Al 2 O 3 nanocomposites. Thermally stimulated current (TSC) is applied to measure the trap parameters of specimens. Breakdown strength and volume resistivity are also measured. The results indicate that small amount of nanoalumina enhances the crystallinity, volume resistivity and breakdown strength, and decreases the crystallite size. The TSC results show that the deep trap level and density both increase at low nanoparticle loading samples (<;1 wt%). It is concluded that the independent interfacial region brought by small amount of nanoparticles generates a new potential barrier φ 2 . It interacts with the original trap sites in LDPE matrix, resulting in the increase of deep traps in nanocomposites. Nanoparticle may act as nucleating agents to modify the morphology and change the deep traps, leading to the reduction of electrical conduction and the improvement of breakdown properties. Both deep trap level and density are benefit to enhance the volume resistivity and breakdown strength. The reduction in mobility of charge carriers, the enhanced height of barrier, the decrease of low density region and the formation of homocharges caused by deep traps are of importance to the reduced conduction and high breakdown performance.
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