Highly ordered, ultralight three-dimensional graphene-like carbon for high-frequency electromagnetic absorption
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Highly ordered, ultralight three-dimensional graphenelike carbon for high-frequency electromagnetic absorption Dianjun Zhang1, Yijun Liao1, Zhaohui Wang1, Xuefeng Zhang1,2,* Zhuopeng Wang3
, Yanhui Zhang1, and
1
School of Materials Science and Engineering, Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Northeastern University, Shenyang 110819, People’s Republic of China 2 Institute of Advanced Magnetic Materials, Hangzhou Dianzi University, Hangzhou 310012, People’s Republic of China 3 Department of Chemistry, College of Sciences, Northeastern University, Shenyang 110819, People’s Republic of China
Received: 22 September 2020
ABSTRACT
Accepted: 3 November 2020
The three-dimensional porous structure of a material can trap the propagating electromagnetic waves by multiple reflections and scatterings, thereby improving the microwave absorption properties. The highly ordered and interconnected porous NaY zeolites can serve as the templates to prepare the three-dimensional graphene (3DG). A high defect density of 13.4–23.7 9 1010 cm-2 was obtained in the 3DG due to the incomplete replication. Simultaneously, the broken asymmetry of space charges in the defect sites will lead to the separation of space charges and the formation of electric dipoles, which results in significantly enhanced dielectric performance and microwave absorption. Consequently, owing to the porous structure and high specific surface area, the effective absorption band of the 3DG attains a large width of 14.3 GHz (3.7–18 GHz) with the absorber thicknesses located in 2–5 mm. The microwave absorption performance of 3DG is much superior to that of multilayer graphene with a two-dimensional structure. Hence, this ultralight 3DG can act as a promising microwave absorption material and probably gifts other physical applications in the future.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction The microwave absorption materials have attracted much attention in recent years because of their prospective applications in electronic devices, Handling Editor: Annela M. Seddon.
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https://doi.org/10.1007/s10853-020-05533-2
industry and military affairs [1–3]. Intense efforts have been devoted to fabricating various microwave absorption materials with diverse components and structures. The ideal microwave absorption materials enjoy the advantages of broad absorption bandwidth, lightweight, chemical stability and thin thickness
J Mater Sci
[4–7]. Among which, graphene has great potential for attenuating microwave due to its low density, high specific surface area and large aspect ratio [8, 9]. However, the electromagnetic absorption performance of pure graphene remains a relatively low level because its high electrical conductivity generally results in poor impedance match and surface microwave reflection. Therefore, some magnetic components or metal oxides were proposed to composite with the graphene, graphene oxide (GO) and reduced
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