Tunable Co/ZnO/C@MWCNTs based on carbon nanotube-coated MOF with excellent microwave absorption properties

doi:10.1016/j.jmst.2022.04.005

Abstract

Abstract:

The development of global information technology makes human life intelligent, and the large-scale use of various electronic devices increases the electromagnetic radiation in the surrounding environment. This has created a requirement for the development of high-performance electromagnetic wave absorbers to eliminate electromagnetic pollution. However, the preparation of electromagnetic wave absorbers with excellent electromagnetic loss capability remains a great challenge. Here, we present a method to prepare Co/ZnO/C@MWCNTs (CZC@M) composites by pyrolysis of ZnCo-MOF@MWCNTs (MOF@M). Specifically, MWCNTs are uniformly distributed on the CZC surface to form multiple heterogeneous interfaces, which will lead to an increase in polarizability. In addition, changing the amounts of MWCNTs in the composite can modulate its dielectric constant and impedance matching properties. Impressively, at only 10% sample content, the minimum reflection loss of −41.75 dB and the maximum effective absorption bandwidth of 4.72 GHz are obtained at thicknesses of 2.4 mm and 2.2 mm, respectively. Overall, the results reported in this work provide a new design strategy for the synthesis of high-performance electromagnetic wave absorbers with potential applications in the elimination of electromagnetic pollution.

Key words: MWCNTs, Metal organic frameworks, CZC@M, Microwave absorption

Zirui Jia, Mingyue Kong, Bowen Yu, Yingzhuo Ma, Jiaying Pan, Guanglei Wu. Tunable Co/ZnO/C@MWCNTs based on carbon nanotube-coated MOF with excellent microwave absorption properties[J]. J. Mater. Sci. Technol., 2022, 127: 153-163.

Figures/Tables 11

Fig. 1. Schematic illustration of the fabrication process of the CZC@M.

Fig. 2. XRD patterns of (a) MWCNTs, MOF, MOF@M; (b) CZC, CZC@M.

Fig. 3. Raman spectra of MWCNTs, CZC and CZC@M.

Fig. 4. XPS survey spectrum (a), Zn2p (b), Co2p (c), O1s (d), N1s (e) and C1s (f) spectra of the CZC@M-50.

Fig. 5. SEM images of (a) MWCNTs, (b) ZnCo-MOF, (c) MOF@M-25, (d) MOF@M-50, (e) MOF@M-75, (f) CZC, (g) CZC@M-25, (h) CZC@M-50 (i) CZC@M-75, and the element mapping of CZC@M-50 ((h1-h5)).

Fig. 6. (a-c) TEM image and (d, e) HRTEM image and (f) SAED of CZC@M-50.

Fig. 7. Electromagnetic parameters of MWCNTs, CZC, CZC@M: (a) real part of permittivity, (b) imaginary part of permittivity, (c) real part of permeability, and (d) imaginary part of permeability, (e) dielectric loss tangent, and (f) magnetic loss tangent.

Fig. 8. Frequency dependence of RL values at different thicknesses for (a, a1, a2) MWCNTs, (b, b1, b2) CZC, (c, c1, c2) CZC@M-25, (d, d1, d2) CZC@M-50 and (e, e1, e2) CZC@M-75.

Fig. 9. (a) Typical Cole-Cole model of CZC@M-50; (b) attenuation constant of MWCNTs, CZC, CZC@M-25, CZC@M-50, CZC@M-75; (c) dependence of λ/4 matching thickness vs RL peak vs |Zin/Z0| plots of CZC@M-50.

Table 1. Electromagnetic wave absorption performances of some system.

Absorbing agent	RL_min (dB)	Thickness (mm)	Efficient bandwidth (RL <−10 dB) (GHz)	Ref.
CZC@M	−41.75	2.4.	4.72	This work
Co/ZnO/RGO	−52.2	3.5	5.6	[27]
C/Co@CNT	−56.8	3.8	4.8	[74]
CNT/Co/C fiber	−14.4	2.0	8.02	[75]
MWCNT/ZnO	−31.45	2.0	——	[76]
Fe/CNT	−25.3	2.9	6.1	[77]
3D CoNi/N-GCT	−34.1	5.0	2.6	[78]
CNT/ZnO	−55.42	3.0	1.87	[79]

Fig. 10. The illustration of the electromagnetic wave absorption mechanism for the CZC@M.

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