MnO<sub>2</sub>纳米棒的吸波性能及其超构表面设计

doi:10.11868/j.issn.1001-4381.2021.000855

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Abstract

MnO₂ nanorods were prepared by using the hydrothermal method and freeze-drying technology, and then molded into the MnO₂/paraffin circular samples in different filling concentrations. The crystalline phase, microstructure and electromagnetic parameters of the samples were characterized and tested by X-ray diffractometer (XRD), scanning electron microscopy (SEM), and vector network analyzer (VNA). Sample meta-surface was designed and simulated by CST software and the pre and post simulation calculation and research of the meta-surface were carried out. The results show that prepared MnO₂ powder has a rod structure with the diameter and length of the rod about 50-100 nm, 5-10 μm, respectively. The single cylindric structure is well-shaped, and the overall structure is homogeneous with crystallinity. Moreover, the tangent of dielectric loss(tanδ) increases with concentration, making a great contribution to the electromagnetic attenuation coefficient (α) of the sample of MnO₂/paraffin, which increases with filling concentration of MnO₂ nanorods. Microwave absorption frequency domain of MnO₂/paraffin material is significantly broadened by the design of meta-surface, namely, the optimal bandwidth in 2-18 GHz can reach 14.32 GHz. The reason is the superposition of absorption peaks over a specified frequency range, which is caused by the coexistence of multiple resonances of the meta-surface.

Key words： hydrothermal method MnO₂ nanorod absorbing mechanism meta-surface

Received: 02 September 2021 Published: 18 July 2022

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Corresponding Authors: Song BI,Zhaohui LIU E-mail: xiaozhu-youyou@163.com;lzh5011@163.com

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	Articles by authors
	Yongzhi SONG
	Song BI
	Genliang HOU
	Hao LI
	Yankai ZHAO
	Zhaohui LIU

Cite this article:

Yongzhi SONG,Song BI,Genliang HOU, et al. Absorbing property of MnO₂ nanorods and its meta-surface design[J]. Journal of Materials Engineering, 2022, 50(7): 110-118.

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http://jme.biam.ac.cn/EN/10.11868/j.issn.1001-4381.2021.000855 OR http://jme.biam.ac.cn/EN/Y2022/V50/I7/110

Schematic flow of MnO₂ nanorods preparation

SEM images of MnO₂ nanorods
(a)low magnification; (b)high magnification

XRD patterns of MnO₂ nanorods

Electromagnetic parameter diagrams of MnO₂ nanorods
(a)ε′; (b)ε″; (c)μ′; (d)μ″

Parametric diagrams of electromagnetic attenuation characteristics of MnO₂ nanorods
(a)M_η; (b)tanδ; (c)α; (d)β

Reflectivity loss curves of MnO₂ nanorods absorber
(a)1 mm; (b)2 mm; (c)3 mm; (d)4 mm; (e)5 mm; (f)6 mm

Reflectivity loss contour plot(1) and d/λ contour plot(2) of MnO₂ nanorod absorbers with different mass fractions
(a)30%;(b)50%;(c)70%

Superconfiguration surface microwave response model
(a)schematic diagram of structure; (b)simulation setup diagram

Reflection loss curve(a) and field distribution map(b) of MnO₂ nanorod superconfiguration surface

Performance comparison between this sample and absorbing materials in recent years

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