Abstract Glass fiber reinforced epoxy composites were fabricated using MWCNT and GNP fillers, individually and in combination. The objective of combining the two conductive fillers was to enhance the electrical conductivity of the composites. The DC and AC conductivity measurements were carried out to assess the influence of individual fillers and their combinations on the electrical conductivity. High DC conductivity of 3.1×10-3 S/m and AC conductivity of 1.31×10-2 S/m at 8MHz were observed, at 2wt.% of MWCNT and 3wt.% of GNP and the values were significantly reduced below 3wt.% of GNP. The observed increase in electrical conductivity is attributed to low contact resistance (299.85Ω) of fillers, reduced tunneling resistance (5.35×109Ω) and tunneling distance (1.65nm) of the composites. The DC and AC conductivity, contact resistance, tunneling resistance and tunneling distance showed reduced dependence on temperature. The AC conductivity of the hybrid composites follows power law. The cut-off frequency of composites was 200 KHz at 3wt.% of GNP and 2 KHz with reduction in weight percentage of GNP. In composite with 2wt.% of MWCNT and 3wt.% of GNP, validity of the percolation model is established.

中文翻译：

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有效利用纳米碳来控制环氧复合材料的导电性

摘要 使用 MWCNT 和 GNP 填料单独或组合制备玻璃纤维增​​强环氧树脂复合材料。结合两种导电填料的目的是提高复合材料的导电性。进行直流和交流电导率测量以评估单个填料及其组合对电导率的影响。在 2wt.% 的 MWCNT 和 3wt.% 的 GNP 下，观察到 3.1×10-3 S/m 的高直流电导率和 1.31×10-2 S/m 的交流电导率在 8MHz 下，并且该值显着降低到 3wt. 以下。占国民生产总值的百分比。观察到的电导率增加归因于填料的低接触电阻（299.85Ω）、复合材料的隧道电阻降低（5.35×109Ω）和隧道距离（1.65nm）。直流和交流电导率、接触电阻、隧穿电阻和隧穿距离对温度的依赖性降低。混合复合材料的交流电导率遵循幂律。复合材料的截止频率在 3wt.% GNP 时为 200 KHz，在 GNP 重量百分比降低时为 2 KHz。在含有 2wt.% MWCNT 和 3wt.% GNP 的复合材料中，建立了渗流模型的有效性。