Powerful absorbing and lightweight electromagnetic shielding CNTs/RGO composite
Powerful absorbing and lightweight electromagnetic shielding CNTs/RGO composite
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强大的吸收和轻质电磁屏蔽 CNT/RGO 复合材料
DOI：
10.1016/j.carbon.2019.01.009
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发表时间：
2019-04-01
期刊：
影响因子：
10.9
通讯作者：
Fan, Hua
中科院分区：
文献类型：
--
作者：
Kong, Luo;Yin, Xiaowei;Fan, Hua
轻量化和优异导电性能的结合是宏观泡沫石墨烯复合材料应用的魅力所在。采用冷冻干燥和原位催化生长法制备了多孔碳纳米管/还原性氧化石墨烯（CNTs/RGO）泡沫复合材料。CNTs/RGO泡沫复合材料由相互连接的RGO纳米片作为三维框架和原位生长的CNTs作为电磁波吸收增强剂生长在石墨烯衬底上组成。在石墨烯纳米片上原位生长的碳纳米管可以增强导电损耗和极化损耗，从而增强吸收屏蔽性能。制备了不同碳纳米管负载的CNTs/RGO泡沫复合材料，研究了其屏蔽x波段电磁的性能。在2 mm厚度下，CNTs/RGO泡沫复合材料的电磁屏蔽效能（SE）达到31.2 dB，特别是在超轻密度为57 mg cm（-3）时，比EMI屏蔽效能达到547 dB cm(3)/g，吸收是主要屏蔽机制。当厚度为3.1 mm时，SE值达到49 dB。由于独特的3D泡沫分层结构、轻密度和出色的SE性能，我们的工作显示了一种有前途的设计方法，可以制备碳纳米管/RGO泡沫复合材料，以制备轻质吸收型EMI屏蔽材料。(c) 2019年Elsevier Ltd.出版
Combination of lightweight and superior electrical conductive performance is charming for the application of macroscopic graphene foam composite. A porous carbon nanotubes/reduced graphene oxide (CNTs/RGO) foam composite are prepared by freeze-drying and in-situ catalytic grown methods. The CNTs/RGO foam composite consists of interconnected RGO nanosheets as the 3D frame and in-situ growth CNTs as the electromagnetic wave (EM) absorbing reinforcement, which grow on graphene substrate. The in-situ grown CNTs on graphene nanosheets lead to the enhancement of conductive and polarization loss, which results in the enhancement of absorption shielding performance. The CNTs/RGO foam composites with different CNT loading are prepared to investigate their EM shielding properties in X-band. The EM shielding effectiveness (SE) of CNTs/RGO foam composite reaches 31.2 dB with 2 mm thickness, especially the specific EMI shielding effectiveness reaches 547 dB cm(3)/g with an ultralight density of 57 mg cm(-3), the absorption is the primary shielding mechanism. Furthermore, SE value reaches 49 dB with thickness of 3.1 mm. Owing to the unique 3D foam hierarchical architecture, light density and outstanding SE performance, our work shows a promising designable approach of preparing CNTs/RGO foam composite to lightweight and absorption type EMI shielding materials. (c) 2019 Published by Elsevier Ltd.