In this paper, graphene/silicone rubber (SiR) nanocomposites with filler contents of 0.001–0.005 wt% are prepared to improve electrical tree inhibiting ability under different temperature gradients. The electrical treeing test is performed under three temperature gradients by controlling the temperature of high voltage and ground sides. Experimental results indicate that the SiR sample with 0.003 wt% graphene presents the best performance on electrical tree resistance. The tree length and accumulated damage are both reduced with the increase of graphene content from 0 to 0.003 wt%, but increased with the further increase of filler content from 0.003 to 0.005 wt%. The tree outline tends to be circular in neat SiR under negative temperature gradient, while it is triangular under positive temperature gradient. However, the effect of temperature gradient is weakened when graphene exists. Based on quantum dot models, the role of graphene quantum wells (QWs) in the regulation of charge transport and electrical tree resistance in SiR is revealed. This research provides an effective method to suppress electrical trees of SiR for cable accessories.

中文翻译：

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石墨烯纳米片和温度梯度影响石墨烯/SiR 纳米复合材料中的电树

在本文中，制备了填料含量为 0.001-0.005 wt% 的石墨烯/硅橡胶 (SiR) 纳米复合材料，以提高不同温度梯度下的电树抑制能力。通过控制高压侧和接地侧的温度，在三种温度梯度下进行电树试验。实验结果表明，含有 0.003 wt% 石墨烯的 SiR 样品表现出最佳的电树电阻性能。随着石墨烯含量从 0 重量％增加到 0.003 重量％，树木长度和累积损伤均减少，但随着填料含量从 0.003 重量％增加到 0.005 重量％而增加。树形轮廓在负温度梯度下在纯 SiR 中趋于圆形，而在正温度梯度下则呈三角形。然而，当石墨烯存在时，温度梯度的影响减弱。基于量子点模型，揭示了石墨烯量子阱 (QW) 在调节 SiR 中的电荷传输和电树电阻中的作用。该研究为抑制电缆附件的SiR电树提供了一种有效的方法。