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Absorbing property of MnO2 nanorods and its meta-surface design |
Yongzhi SONG, Song BI( ), Genliang HOU, Hao LI, Yankai ZHAO, Zhaohui LIU( ) |
Rocket Force University of Engineering, Xi'an 710025, China |
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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.
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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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Schematic flow of MnO2 nanorods preparation
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SEM images of MnO2 nanorods (a)low magnification; (b)high magnification
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XRD patterns of MnO2 nanorods
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Electromagnetic parameter diagrams of MnO2 nanorods (a)ε′; (b)ε″; (c)μ′; (d)μ″
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Parametric diagrams of electromagnetic attenuation characteristics of MnO2 nanorods (a)Mη; (b)tanδ; (c)α; (d)β
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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
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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%
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Superconfiguration surface microwave response model (a)schematic diagram of structure; (b)simulation setup diagram
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Reflection loss curve(a) and field distribution map(b) of MnO2 nanorod superconfiguration surface
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Absorbing material | Filling amount/% | Thickness/mm | Peak value/dB | Bandwidth/GHz | Reference | Samples presented | 70 | 5 | -31 | 14.32 | | α-MnO2 nanowire | 20 | 3.6 | -35 | 3.8 | [21] | α-MnO2 nanourchin | 50 | 3.75 | -36 | 5.6 | [22] | RGO/SiC/CNT | 1.27 | 2.9 | -20 | 4.4 | [23] | HGS@PAC | 10 | 5 | -32.43 | 4.2 | [24] | Fe3O4 nanobelt | 16.7 | 2.32 | -53.93 | 4.93 | [25] |
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Performance comparison between this sample and absorbing materials in recent years
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