Low-frequency Microwave Absorption of CIPs@Mn0.8Zn0.2Fe2O4-CNTs Composites

doi:10.15541/jim20230333

Abstract

Abstract:

Development of 5 G wireless communication and low-frequency radar detection has made low- frequency electromagnetic wave radiation a serious problem today. Although research on medium and high frequency band absorbing materials is now relatively mature, designing low frequency band absorbing materials remains a major challenge. Here, we designed a low-band composite absorbing material of 0.5-3 GHz based on the quarter-wavelength cancellation mechanism. A CIPs@Mn_0.8Zn_0.2Fe₂O₄-CNTs ternary composites were prepared by using a simple one-step hydrothermal method, which involved growing ferrite on the surface of carbonyl iron powder and carbon nanotubes. The influence of carbon nanotube content on the absorption peak frequency of the material was investigated. Experimental results show that carbon nanotubes enhances the material's attenuation coefficient by introducing additional interfacial polarization, dipole polarization and other loss mechanisms. Furthermore, coupling of high dielectric and high permeability enables the material to achieve better impedance matching in the low frequency band based on the quarter-wavelength cancellation mechanism. At a thickness of 4 mm, the reflection loss of the samples was obtained at 2.11 GHz and 1.75 GHz, with a -10 dB bandwidth of 1.70-2.70 GHz and 1.40-2.20 GHz, respectively. The composites exhibit excellent low-frequency absorption performance, endowing it highly suitable for applications helped by its simple preparation process and well low-frequency absorption. This research provides a new method for developing more effective low-frequency absorbing materials.

Key words: carbon nanotubes, composite material, carbonyl iron powder, wavelength cancellation, low- frequency absorption

CLC Number:

TB332
O441

CHEN Haiyan, TANG Zhipeng, YIN Liangjun, ZHANG Linbo, XU Xin. Low-frequency Microwave Absorption of CIPs@Mn_0.8Zn_0.2Fe₂O₄-CNTs Composites[J]. Journal of Inorganic Materials, 2024, 39(1): 71-80.

Figures/Tables 16

Fig. 1 Relationship between absorbing curve of the material and the quarter-wavelength matching curve[16]

Fig. 2 Schematic illustration for preparation of the composites

Fig. 3 XRD patterns of different samples (a) CFC1, CFC2, CFC3 and CIP-F; (b) MWCNTs

Fig. 4 SEM images of samples at different magnifications (a, b) MWCNTs; (c) CIP-F; (d-f) CFC3

Fig. 5 XPS spectra of sample CFC3 (a) Survey spectrum; (b-f) High-resolution spectra for CFC3 (b) C, (c) O, (d) Fe, (e) Mn, (f) Zn

Fig. 6 Electromagnetic parameters and loss tangent curves of samples Colorful figures are available on website

Fig. 7 RL diagrams of samples (a-d) 2D diagram; (e-h) 3D diagram; Colorful figures are available on website

Fig. 8 Analyses of loss capacities of samples (a-d) Cole-Cole curves; (e) Eddy current loss curves; (f) Attenuation constant curves; Colorful figures are available on website

Fig. 9 2D impedance spectra of samples (a) CIP-F; (b) CFC1; (c) CFC2; (d) CFC3

Fig. S1 SEM image of carbonyl iron powder raw materials

Fig. S2 EDS mappings of CFC3

Fig. S3 SEM image of CF10

Fig. S4 Electromagnetic parameters of CF5,CF10,and CF15

Fig. S5 SEM image of CIP/C3

Fig. S6 Electromagnetic parameters of CIP/C1, CIP/C2, and CIP/C3

Fig. S7 Hysteresis Loops of CIP-F, CFC3, CF10, and CIP/C

References 35

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Low-frequency Microwave Absorption of CIPs@Mn_0.8Zn_0.2Fe₂O₄-CNTs Composites

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