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Influence from defects of three-dimensional graphene networks on the interface condition between the graphene basal plane and various resins

机译：三维石墨烯网络缺陷对石墨烯基面与各种树脂界面条件的影响

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摘要

Graphene assisted thermal interface materials (TIMs) attract more and more attention because of their high thermal conductivities. However, how to improve the phonon transport ability at the interface between the graphene basal plane and the matrix is still unclear. In this study, three-dimensional graphene networks (3DGNs) with varying defect densities are fabricated by adjusting the chemical vapor deposition processes, and these specimens are adopted as fillers to modify various resins with different functional groups to reveal the interface contact rule. By optimizing the defect density of the 3DGNs, a synergy between the thermal boundary resistances of the filler and matrix and the high intrinsic thermal conductivity of the filler can be achieved in the resulting TIMs, and the epoxy group from the matrix is found to be the best active group to form a close contact between the defects of the 3DGNs. After that, the thermal performance stability of the resulting TIMs under a high temperature for a long time is detected, and the influence from increased Umklapp scattering is partially offset by the weakened Kapitza scattering. Moreover, the corresponding mechanical properties have been measured to confirm the feasibility of the resulting TIMs for practical application areas.
机译：石墨烯辅助的热界面材料（TIMs）由于其高导热率而受到越来越多的关注。但是，如何提高在石墨烯基面与基体之间的界面处的声子传输能力尚不清楚。在这项研究中，通过调整化学气相沉积工艺来制造具有不同缺陷密度的三维石墨烯网络（3DGN），并将这些样品用作填充剂，以修饰具有不同官能团的各种树脂，以揭示界面接触规律。通过优化3DGN的缺陷密度，可以在所得TIM中实现填料与基体的热边界电阻与填料的高固有热导率之间的协同作用，并且发现基体中的环氧基是最佳活性基团，以在3DGN的缺陷之间形成紧密接触。此后，可以检测到所得TIM长时间处于高温下的热性能稳定性，而减弱的Kapitza散射可部分抵消Umklapp散射增加带来的影响。此外，已测量了相应的机械性能，以确认所得TIM在实际应用领域中的可行性。

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