Gamma-ray irradiation induced variation in charge transport behavior of polyethylene based boron nitride/silica micro/nanocomposites
Gamma-ray irradiation induced variation in charge transport behavior of polyethylene based boron nitride/silica micro/nanocomposites
复制标题
伽马射线辐照引起聚乙烯基氮化硼/二氧化硅微/纳米复合材料电荷传输行为的变化
DOI：
10.1109/tdei.2020.008520
复制
发表时间：
2020-04-01
影响因子：
3.1
通讯作者：
Wang, Xiaofang
中科院分区：
文献类型：
--
作者：
Gao, Yu;Xu, Bangbang;Wang, Xiaofang
本文研究了最大总剂量为1000 kGy的Co-60 γ射线辐照对聚乙烯基微/纳米复合材料中电荷输运的影响。微米尺寸的六方氮化硼（BN）和纳米尺寸的二氧化硅（SiO2）填料用于这项工作。表面电位衰减测量被用来评估复合样品中的电荷输运。扫描电子显微镜，傅里叶变换红外光谱，差示扫描量热法，和凝胶含量技术被用来了解辐射引起的复合材料的微观结构的变化。结果表明，随着γ射线剂量的增加，载流子陷阱中心变浅，载流子迁移率有增加的趋势，这种影响与填料的加入减轻。有人建议，辐射引起的结晶度和空隙的外观和羰基的形成减少是负责所观察到的效果。微米和纳米尺寸的颗粒阻碍氧的渗透，从而减少氧化，并且γ射线照射诱导复合材料中增加的电荷传输。
This paper examines the effect of Co-60 gamma-ray irradiation to a maximum total dose of 1000 kGy on the charge transport in polyethylene based micro/nanocomposites. Micron sized hexagonal boron nitride (BN) and nano size silica (SiO2) fillers are used in this work. Surface potential decay measurement are used to evaluate the charge transport in the composite samples. Scanning electron microscopy, Fourier transform infrared spectrum, differential scanning calorimetry, and gel content techniques are used to understand the irradiation induced variations in the microstructure of the composites. The results indicate that the carrier trap center becomes shallower and the carrier mobility tends to increase with increasing gamma ray dose and this effect is mitigated with the addition of fillers. It is suggested that the radiation induced reduction in the crystallinity and the appearance of voids and the formation of carbonyl groups are responsible for the observed effect. The micron- and the nano-size particles hinder the penetration of oxygen, thereby reducing oxidation, and the gamma-ray irradiation induces increased charge transport in the composites.