Highly enhanced microwave absorption for carbon nanotube/barium ferrite composite with ultra-low carbon nanotube loading

doi:10.1016/j.jmst.2021.06.032

Abstract

Abstract:

Barium ferrite (BaFe₁₂O₁₉) is considered as potential microwave absorption (MA) material thanks to the large saturation magnetization, high Curie temperature, and excellent chemical stability. The integration of carbon nanotube (CNT) can improve the dielectric loss of BaFe₁₂O₁₉ for further enhanced MA performance, nevertheless, the MA performance is still not desirable because of the poor CNT dispersion in the CNT/BaFe₁₂O₁₉ composites, which usually prepared via the ball-milling method, unless high CNT loading was used. Herein, according to the thermal stability of CNT in different atmosphere and the formation mechanism of BaFe₁₂O₁₉ from precursor, CNT was introduced in the precursor of BaFe₁₂O₁₉ uniformly during auto-ignition process and calcined under different atmosphere. When CNT loading is only 2.0 wt%, the CNT/BaFe₁₂O₁₉ composites obtained exhibits a minimum reflection loss (RL_min) of-43.9 dB and effective bandwidth (with RL <-10 dB) of 3.9 GHz with the thickness of 1.5 mm, which are much superior to-10.2 dB and 2.2 GHz for pure BaFe₁₂O₁₉, and-13.6 dB and 2.5 GHz for CNT/BaFe₁₂O₁₉ composite prepared by ball-milling method. These results may pave the way to design high-performance BaFe₁₂O₁₉ based microwave absorbers.

Key words: Carbon nanotube, Barium ferrite, Microwave absorption

Yue-Yi Wang, , Wen-Jin Sun, Kun Dai, Ding-Xiang Yan, Zhong-Ming Li. Highly enhanced microwave absorption for carbon nanotube/barium ferrite composite with ultra-low carbon nanotube loading[J]. J. Mater. Sci. Technol., 2022, 102: 115-122.

Figures/Tables 10

Fig. 1. Schematic illustration of the preparation of CNT/BaFe12O19 composites.

Fig. 2. TEM images of (a) BF, (b) BF/C0.5 (c) BF/C1 and (d) BF/C2.

Fig. 3. Magnetic hysteresis loops of BF, BF/C0.5, BF/C1and BF/C2.

Fig. 4. Simulated curves of reflection loss of (a) BF, (b) BF/C0.5, (c) BF/C1, (d) BF/C2 in 2-18 GHz.

Table 1 Comparison of the MA property of the reported BaFe12O19-based composites.

Composites	Mass fraction of carbon materials	RL_min	Bandwidth (<-10 dB)	References
BaFe₁₂O₁₉/CNT	2%	-43.9 dB	3.9 GHz	This work
BaFe₁₂O₁₉/CNT	20%	-29.7 dB	3.2 GHz	[17]
BaFe₁₂O₁₉/CNT	/	-21.5 dB	2.5 GHz	[18]
BaFe₁₂O₁₉/Active carbon	33.3%	-1.1 dB	/	[30]
CNTs/Graphene/BaFe₁₂O₁₉	7.2%	-18.4 dB	3.3 GHz	[31]
BaFe₁₂O₁₉/ZnFe₂O₄/CNTs	20%	-43.2 dB	3.0 GHz	[32]
CNTs/graphite/BaFe₁₂O₁₉	18%	-45.8 dB	4.2 GHz	[24]
Graphene/BaFe₁₂O₁₉/CoFe₂O₄	16%	-32.4 dB	3.0 GHz	[33]

Fig. 5. (a) Real part of permittivity, (b) imaginary part of permittivity and (c) dielectric loss tangent of BF, BF/C0.5, BF/C1 and BF/C2. (d) Real part of permeability, (e) imaginary part of permeability and (f) magnetic loss tangent of BF, BF/C0.5, BF/C1 and BF/C2.

Fig. 6. Cole-Cole curves of (a) BF, (b) BF/C0.5, (c) BF/C1 and (d) BF/C2.

Fig. 7. (a) Plots of C0 and (b) attenuation loss of BF, BF/C0.5, BF/C1 and BF/C2.

Fig. 8. Calculated frequency-dependent RL and λ/4 and 3λ/4 versus frequency for (a) BF, (b) BF/C0.5, (c) BF/C1 and (d) BF/C2.

Fig. 9. Scheme of primary microwave absorption of CNT/BaFe12O19 composite.

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