Tang Bo, Chen Haiqun, Sun Yunfei, Li Mingan, Wang Zhengwei, Yu Haogang, Ma Tingting, Li Sen
Jiangsu Key Laboratory of Oil and Gas Storage and Transportation Technology, School of Petroleum Engineering, Changzhou University Changzhou 213016 People's Republic of China
College of Electronic and Information Engineering, Suzhou University of Science and Technology Suzhou Jiangsu 215009 People's Republic of China.
RSC Adv. 2018 Aug 3;8(49):27811-27817. doi: 10.1039/c8ra04932g. eCollection 2018 Aug 2.
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.
石墨烯辅助热界面材料（TIMs）因其高导热率而受到越来越多的关注。然而，如何提高石墨烯基面与基体之间界面处的声子传输能力仍不清楚。在本研究中，通过调整化学气相沉积工艺制备了具有不同缺陷密度的三维石墨烯网络（3DGNs），并将这些样品用作填料来改性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3DGNs的缺陷密度，在所得的TIMs中可以实现填料与基体的热边界电阻以及填料的高本征热导率之间的协同作用，并且发现基体中的环氧基团是在3DGNs缺陷之间形成紧密接触的最佳活性基团。此后，检测了所得TIMs在高温下长时间的热性能稳定性，并且增加的Umklapp散射的影响被减弱的Kapitza散射部分抵消。此外，还测量了相应的机械性能，以确认所得TIMs在实际应用领域的可行性。
