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Thermally Reduced Graphene Oxide/Carbon Nanotube Composite Films for Thermal Packaging Applications

机译：用于热包装应用的热还原氧化石墨烯/碳纳米管复合薄膜

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摘要

Thermally reduced graphene oxide/carbon nanotube (rGO/CNT) composite films were successfully prepared by a high-temperature annealing process. Their microstructure, thermal conductivity and mechanical properties were systematically studied at different annealing temperatures. As the annealing temperature increased, more oxygen-containing functional groups were removed from the composite film, and the percentage of graphene continuously increased. When the annealing temperature increased from 1100 to 1400 °C, the thermal conductivity of the composite film also continuously increased from 673.9 to 1052.1 W m K . Additionally, the Young’s modulus was reduced by 63.6%, and the tensile strength was increased by 81.7%. In addition, the introduction of carbon nanotubes provided through-plane thermal conduction pathways for the composite films, which was beneficial for the improvement of their through-plane thermal conductivity. Furthermore, CNTs apparently improved the mechanical properties of rGO/CNT composite films. Compared with the rGO film, 1 wt% CNTs reduced the Young’s modulus by 93.3% and increased the tensile strength of the rGO/CNT composite film by 60.3%, which could greatly improve its flexibility. Therefore, the rGO/CNT composite films show great potential for application as thermal interface materials (TIMs) due to their high in-plane thermal conductivity and good mechanical properties.
机译：通过高温退火工艺成功制备了热还原氧化石墨烯/碳纳米管（rGO / CNT）复合膜。在不同的退火温度下系统地研究了它们的微观结构，导热性和机械性能。随着退火温度的升高，从复合膜中去除了更多的含氧官能团，并且石墨烯的百分比连续增加。当退火温度从1100℃增加到1400℃时，复合膜的热导率也从673.9Wm K连续增加。此外，杨氏模量降低了63.6％，抗拉强度提高了81.7％。另外，碳纳米管的引入为复合膜提供了贯穿平面的导热路径，这有利于提高其贯穿平面的导热率。此外，CNT明显改善了rGO / CNT复合膜的机械性能。与rGO薄膜相比，1 wt％的CNTs的杨氏模量降低了93.3％，rGO / CNT复合薄膜的拉伸强度提高了60.3％，这可以极大地提高其柔韧性。因此，rGO / CNT复合膜由于其高的面内热导率和良好的机械性能而具有作为热界面材料（TIMs）的巨大潜力。

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