Abstract Spacecraft materials are a key limiting factor for the rapid development of the aerospace exploration field. In an advanced spacecraft, superior multi-functional material with thermal management and electromagnetic shielding can ensure the normal operation of its equipment in space. Currently, graphene thin film can’t satisfy a high heat flux and excellent through-plane thermal conduction. In this contribution, a full-carbon dual-functional graphene/carbon nanotubes (CNTs) thick film with high heat flux was successfully prepared, and the structure and composition evolution was investigated after hot-pressing carbonization and graphitization of 2800 °C, which indicates the existence of a compact defects-free and high crystalline carbon structure. Molecular dynamics simulations further confirm the formation of C–C covalent bonds between graphene sheets and CNTs after 2800 °C graphitization, enhancing the phonons transfer in through-plane. Simultaneously, the axially adjacent graphene sheets are connected by the CNTs, which endow excellent thermal conductive properties. The in-plane and through-plane thermal diffusivity are as high as 1188.2 mm2/s and 8.0 mm2/s, respectively. Moreover, the electrical conductivity up to 1819.17 S/cm and EMI SE reach 75 dB in Ku-band. The results provide a bright prospect for spacecraft materials preparation and application.

中文翻译：

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双功能石墨烯/碳纳米管厚膜：双向散热和电磁屏蔽

摘要 航天器材料是航天探索领域快速发展的关键限制因素。在先进的航天器中，具有热管理和电磁屏蔽的优良多功能材料可以保证其设备在太空中的正常运行。目前，石墨烯薄膜不能满足高热通量和良好的平面热传导。在此贡献中，成功制备了具有高热通量的全碳双功能石墨烯/碳纳米管 (CNTs) 厚膜，并研究了 2800 °C 热压碳化和石墨化后的结构和组成演变，表明存在致密的无缺陷和高结晶碳结构。分子动力学模拟进一步证实了在 2800 °C 石墨化后石墨烯片和 CNT 之间形成了 C-C 共价键，增强了声子在平面内的传递。同时，轴向相邻的石墨烯片通过碳纳米管连接，具有优异的导热性能。面内和面内热扩散率分别高达 1188.2 mm2/s 和 8.0 mm2/s。此外，Ku 波段的电导率高达 1819.17 S/cm，EMI SE 达到 75 dB。研究结果为航天器材料的制备和应用提供了广阔的前景。面内和面内热扩散率分别高达 1188.2 mm2/s 和 8.0 mm2/s。此外，Ku 波段的电导率高达 1819.17 S/cm，EMI SE 达到 75 dB。研究结果为航天器材料的制备和应用提供了广阔的前景。面内和面内热扩散率分别高达 1188.2 mm2/s 和 8.0 mm2/s。此外，Ku 波段的电导率高达 1819.17 S/cm，EMI SE 达到 75 dB。研究结果为航天器材料的制备和应用提供了广阔的前景。