Facile synthesis of three-dimensional lightweight nitrogen-doped graphene aerogel with excellent electromagnetic wave absorption properties
Facile synthesis of three-dimensional lightweight nitrogen-doped graphene aerogel with excellent electromagnetic wave absorption properties
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轻松合成具有优异电磁波吸收性能的三维轻质氮掺杂石墨烯气凝胶
DOI：
10.1007/s10853-017-1838-3
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发表时间：
2018-03
影响因子：
4.5
通讯作者：
刘河洲
中科院分区：
文献类型：
--
作者：
周洁;陈玉洁;李华;Roberto Dugnani;杜起;Hafeez UrRehman;康红梅;刘河洲
通信设备和电子设备的广泛使用增加了对新型高效轻质微波吸收材料的需求。在这项工作中，我们提出使用N-掺杂的石墨烯（NG）/蜡复合材料，其中互连的3D石墨烯网络用作蜡基质中的填料。采用水热法将氮原子置换掺杂到石墨烯晶格中。研究发现，控制NG的量可以有效地调节石墨烯的电学性质。对制备的样品的检查表明，在很大程度上，真空注入方法有效地保留了石墨烯完整的3D结构。当NG含量为3.6wt%时，样品的微波吸收性能最好，厚度为3.3mm时，在13.10GHz处的最小反射损耗为53.25dB，反射损耗小于10 dB（90%吸收）的带宽可达8.15GHz。结果表明，氮掺杂石墨烯可以大大提高电磁波吸收体的介电损耗。更重要的是，提出的工作提供了一个独特的简易方法来制造低成本NG/蜡复合材料的框架，具有很强的电磁波吸收能力，在非常低的填料加载。
The widespread use of communication facilities and electronic devices has increased the demand for novel high-efficiency and lightweight microwave absorption materials. In this work, we propose using N-doped graphene (NG)/wax composites, where an interconnected 3D graphene network is used as filler in a wax matrix. Nitrogen atoms were substitutionally doped into the graphene lattice by hydrothermal method. It was found that controlling the amount of NG could effectively modulate the electrical properties of graphene. Inspection of the samples prepared showed that to a large extent, the vacuum infusion method effectively retained the graphene intact 3D structure. Samples filled with 3.6 wt% NG exhibited the most prominent microwave absorption properties; the minimum reflection loss registered was 53.25 dB at 13.10 GHz for a sample thickness of 3.3 mm, and the bandwidth of the reflection loss less than 10 dB (90% absorption) can reach up to 8.15 GHz. The result indicates that the nitrogen-doped graphene can greatly improve the dielectric loss of electromagnetic wave absorber. More importantly, the work presented provides the framework for a unique facile approach to manufacture low-cost NG/wax composites with strong electromagnetic wave absorption ability at very low filler loading.
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期刊：
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