Abstract The hybrid composite films containing nanodiamonds (ND) coated with polydopamine (pDA) (ND-pDA) and reduced graphene oxide (rGO) converted from graphene oxide (GO) films are designed for achieving extremely high thermal conductivity. The ND-pDA/rGO films are successfully fabricated using the vacuum-filtration process followed by a heat treatment at 800 °C. The thermal conductivities of the films in the in-plane (K//) and through-plane (K⊥) directions are measured by the laser flash method to better understand how the addition of dopamine, the amount of ND-pDA, and the test temperature affect the thermal properties of the hybrid films. The experimental results show that the addition of dopamine results in dense structure of the ND-pDA/rGO hybrid films, which is favorable for phonon transport, and thus remarkably increase the thermal properties of the film. Additionally, films with higher ND-pDA loading possess lower in-plane but higher through-plane thermal conductivity. K// and K⊥ of 1406 and 0.677 W m−1 K−1, respectively, for 20ND-pDA/20rGO measured at 25 °C are achieved. Both the K// and K⊥ of 20ND-pDA/20rGO increase with test temperature. Maintaining such high thermal conductivities at high temperature, the hybrid films are believed to be suitable for lightweight thermal management materials with high heat transfer properties in a specific direction.

中文翻译：

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纳米金刚石-聚多巴胺/薄层石墨烯复合薄膜的极高热导率

摘要 包含涂有聚多巴胺 (pDA) (ND-pDA) 的纳米金刚石 (ND) 和由氧化石墨烯 (GO) 薄膜转化而来的还原氧化石墨烯 (rGO) 的混合复合薄膜旨在实现极高的热导率。ND-pDA/rGO 薄膜是使用真空过滤工艺成功制造的，然后在 800°C 下热处理。通过激光闪光法测量薄膜在面内 (K//) 和穿面 (K⊥) 方向的热导率，以更好地了解多巴胺的添加、ND-pDA 的量和测试温度影响混合薄膜的热性能。实验结果表明，多巴胺的加入使 ND-pDA/rGO 杂化膜结构致密，有利于声子传输，从而显着提高薄膜的热性能。此外，具有较高 ND-pDA 负载量的薄膜具有较低的面内热导率但较高的面内热导率。在 25 °C 下测量的 20ND-pDA/20rGO 的 K// 和 K⊥ 分别为 1406 和 0.677 W m-1 K-1。20ND-pDA/20rGO 的 K// 和 K⊥ 都随着测试温度的增加而增加。在高温下保持如此高的热导率，混合膜被认为适用于在特定方向具有高传热性能的轻质热管理材料。20ND-pDA/20rGO 的 K// 和 K⊥ 都随着测试温度的增加而增加。在高温下保持如此高的热导率，混合膜被认为适用于在特定方向具有高传热性能的轻质热管理材料。20ND-pDA/20rGO 的 K// 和 K⊥ 都随着测试温度的增加而增加。在高温下保持如此高的热导率，混合膜被认为适用于在特定方向具有高传热性能的轻质热管理材料。