[题名] 热压制备高导热率石墨烯-全氟烷氧基纳米复合材料

[作者] Xinru Zhang , Xiaoyu Xie  , Xinzhi Cai , Zeyi Jiang, Ting Gao  , Yujie Ren  , Jian Hu and Xinxin Zhang

[摘要] 这段文字主要讨论了通过热压和机械加工技术制备的高导热性聚合物纳米复合材料。该复合材料由石墨烯纳米片（GNs）和聚氟代烯烃（PFA）组成，其中石墨烯纳米片在聚氟代烯烃基质中垂直排列。当石墨烯纳米片的含量超过10 wt%时，复合材料的导热性能显著提高，其面内导热系数（in-plane TC）比面外导热系数（through-plane TC）高出10-15倍。特别地，当石墨烯纳米片的含量为30 wt%时，复合材料的面外导热系数达到25.57 W/(m·K)，比纯聚氟代烯烃高出9700%。此外，将这种复合材料应用于高功率发光二极管（LED）的散热，其表面温度比纯聚氟代烯烃降低了约16 ℃。这种简单、低成本的方法可以大规模生产高导热性的石墨烯纳米片-聚氟代烯烃复合材料，适用于各种热管理应用。

[关键词] 热压、机械加工、PFA、复合材料、石墨烯纳米片、高功率、发光二极管

[Title] Graphene−Perfluoroalkoxy Nanocomposite with High Through-Plane Thermal Conductivity Fabricated by Hot-Pressing

[Author] Xinru Zhang , Xiaoyu Xie , Xinzhi Cai , Zeyi Jiang, Ting Gao , Yujie Ren, Jian Hu and Xinxin Zhang

[Abstract] With the rapid development of electronics and portable devices, polymer nanocomposites with high through-plane thermal conductivity (TC) are urgently needed. In this work, we fabricated graphene nanosheets−perfluoroalkoxy (GNs−PFA) composite sheets with high through-plane TCs via hot-pressing followed by mechanical machining. When the GNs content exceeded 10 wt%, GNs were vertically aligned in the PFA matrix, and the through-plane TCs of nanocomposites were 10–15 times higher than their in-plane TCs. In particular, the composite with 30 wt% GNs exhibited a through-plane TC of 25.57 W/(m·K), which was 9700% higher than that of pure PFA. The composite with 30 wt% GNs was attached to the surface of a high-power light-emitting diode (LED) to assess its heat-dissipation capability. The composite with vertically aligned GNs lowered the LED surface temperature by approximately 16 ◦C compared with pure PFA. Our facile, low-cost method allows for the large-scale production of GNs–PFA nanocomposites with high through-plane TCs, which can be used in various thermal-management applications.

[Keywords] thermal conductivity; nanocomposite; graphene; alignment; hot-pressing;perfluoroalkoxy