In this study, epoxy resins incorporated with nano-alumina (nano-Al2O3) are prepared with different concentrations of 0, 1, 3 and 5 wt%. The obtained epoxy resin/Al2O3 nanocomposites are subsequently fluorinated using F2/N2 mixture (F2/N2 20% v/v) at 0.05 MPa and 40°C. The nano-Al2O3 is treated with silane coupling agent γ-aminopropyltriethoxysilane (KH550) to restrict aggregation. The chemical bonding is examined by Fourier-transform infrared spectroscopy. The cross-section and surface morphological analyses are performed using scanning electron microscopy. In addition, the DC surface resistivity is measured using a resistivity test fixture. The variations in electrical properties induced by fluorination are characterized based on dielectric measurements. The experimental results show that chemical bonds are formed between nano-Al2O3 and the coupling agent (KH550). Moreover, the results confirm that fluorination significantly alters the morphology and chemical structure of the sample surface. Gas-phase fluorination produces shallow traps, which consequently reduce the surface resistivity. The treatment of nano-Al2O3 increases the trap energy level to yield higher surface resistivity. Furthermore, the treated Al2O3 nanoparticles show improved distribution and dispersion in epoxy resin, exhibiting good dielectric performance of the nanocomposite.

中文翻译：

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纳米氧化铝和气相氟化处理对环氧树脂/氧化铝纳米复合材料介电性能的影响

在这项研究中，环氧树脂与纳米氧化铝（纳米铝2哦3) 以 0、1、3 和 5 wt% 的不同浓度制备。得到的环氧树脂/Al2哦3 纳米复合材料随后使用 F 氟化2/N2 混合物 (F2/N220% v/v) 在 0.05 MPa 和 40°C。纳米铝2哦3用硅烷偶联剂γ-氨基丙基三乙氧基硅烷（KH550）处理以限制聚集。通过傅里叶变换红外光谱检查化学键。使用扫描电子显微镜进行横截面和表面形态分析。此外，直流表面电阻率是使用电阻率测试夹具测量的。由氟化引起的电特性的变化基于介电测量来表征。实验结果表明，纳米铝之间形成了化学键。2哦3和偶联剂（KH550）。此外，结果证实氟化显着改变了样品表面的形态和化学结构。气相氟化产生浅陷阱，从而降低表面电阻率。纳米铝的处理2哦3增加陷阱能级以产生更高的表面电阻率。此外，处理后的铝2哦3 纳米粒子在环氧树脂中的分布和分散性得到改善，表现出纳米复合材料良好的介电性能。