Magnetic Ni/graphene connected with conductive carbon nano-onions or nanotubes by atomic layer deposition for lightweight and low-frequency microwave absorption
Magnetic Ni/graphene connected with conductive carbon nano-onions or nanotubes by atomic layer deposition for lightweight and low-frequency microwave absorption
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通过原子层沉积将磁性镍/石墨烯与导电碳纳米洋葱或纳米管连接，以实现轻质和低频微波吸收
DOI：
10.1016/j.cej.2019.122980
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发表时间：
2020-02
影响因子：
15.1
通讯作者：
Wang Guilong
中科院分区：
文献类型：
--
作者：
Xu Xuefei;Wang Guizhen;Wan Gengping;Shi Shaohua;Hao Chuncheng;Tang Yuling;Wang Guilong
由于快速发展的电子技术产生的电磁（EA）污染日益严重，微波吸收材料（MAM）得到了深入的研究。轻质、高电导率的石墨烯基MAM非常有前景，但在低填料填充率的情况下实现令人满意的低频微波吸收性能也存在很大的挑战。在这里，通过原子层沉积辅助方法精确控制NiO的尺寸和含量，设计并合成了两种新颖的分层结构：附着在石墨烯表面的Ni@碳纳米洋葱和Ni/碳纳米管（Ni@C/G和Ni/CNT/G）。这种创新结构赋予它们多种微波吸收优势，包括多接口、微电流网络和良好的阻抗匹配，从而确保它们成为高效、低密度的低频微波吸收体。优化后的NCG 100在C波段表现出优异的微波吸收性能，在6.2GHz处最小RL值达到-45.5dB，在2.5mm厚度时测得最宽吸收频带为5.6GHz。此外，与大多数石墨烯基和镍基吸收剂相比，Ni@C/G和Ni/CNT/G通过利用仅15%的较低填料填充率实现了更高的性能。我们的研究结果可能为设计轻量级低频 MAM 铺平道路。
Microwave absorbing materials (MAMs) have been researched in depth due to the increasing electromagnetic (EA) pollution produced by rapid-developed electronic technologies. Lightweight and high-conductivity graphene-based MAMs are quite promising, but there also exists a big challenge for them to achieve satisfactory low-frequency microwave absorption performance with a low filler loading ratio. Here, two novel hierarchical structures, Ni@carbon nano-onions and Ni/carbon nanotubes adhering on graphene surfaces (Ni@C/G and Ni/CNT/G) were designed and synthesized by precisely controlling the size and content of NiO with an atomic layer deposition-assisted method. Such innovative constructions can endow them a variety of advantages for microwave absorption including multiple interfaces, micro-current networks and good impedance matching, which ensures them to be high-efficiency and low-frequency microwave absorbers with low densities. Optimized NCG 100 exhibits excellent microwave absorption performance in C band with the minimum RL value reaching −45.5 dB at 6.2 GHz, and the widest absorption band was measured to be 5.6 GHz at the thickness of 2.5 mm. In addition, compared to most of graphene- and Ni-based absorbers, Ni@C/G and Ni/CNT/G achieve higher performance by utilizing a lower filler loading ratio of only 15%. Our findings may pave the way for designing lightweight low-frequency MAMs.
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