Synthesis and characterization of MoS2/Fe@Fe3O4 nanocomposites exhibiting enhanced microwave absorption performance at normal and oblique incidences

doi:10.1016/j.jmst.2019.05.021

Abstract

Abstract:

Herein, we attempted to prepare MoS₂/Fe@Fe₃O₄ nanocomposites capable of strongly absorbing broadband incident electromagnetic (EM) radiation and probed the effects of their composition on complex permittivity and permeability at 2-18 GHz. Calculations of normal-incidence reflection losses (RLs) based on EM parameters revealed that the Fe@Fe₃O₄ to MoS₂ mass ratio strongly influenced the absorption peak intensity and bandwidth. Specifically, an RL peak of -31.8 dB@15.3 GHz and a bandwidth (RL < - 10 dB) of 4.8 GHz (13.2-18 GHz) were achieved at a thickness of 1.52 mm and a Fe@Fe₃O₄ to MoS₂ mass ratio of 60:40. Further, RL and bandwidth were investigated for oblique incidence, in which case two kinds of EM waves (TE - electric field perpendicular to plane of incidence; TM - electric field in the plane of incidence) were considered. The absorption peaks of TE and TM waves did not exceed -20 dB when the incidence angle increased to 30°, and the bandwidth (RL < - 10 dB) reached 4.2 GHz (TE wave) and 4.0 GHz (TM wave) when this angle was further increased to 40.0° and 50.4°, respectively. Finally, the mechanism of microwave absorption was discussed in detail.

Key words: Permittivity, Permeability, Microwave absorption, Electromagnetic loss, Interface cancellation

Peng Wang, Junming Zhang, Guowu Wang, Benfang Duan, Donglin He, Tao Wang, Fashen Li. Synthesis and characterization of MoS2/Fe@Fe3O4 nanocomposites exhibiting enhanced microwave absorption performance at normal and oblique incidences[J]. J. Mater. Sci. Technol., 2019, 35(9): 1931-1939.

Figures/Tables 15

Fig. 1. XRD patterns of (a) MoS2 NSs, (b) Fe@Fe3O4 NPs, and (c) Fe-30.

Fig. 2. (a) Mo 3d spectrum of MoS2 NSs and (b) Fe 2p spectrum of Fe@Fe3O4 NPs.

Fig. 3. (a) SEM image of MoS2 NSs, (b, c) TEM images of Fe@Fe3O4 NPs, (d) SAED pattern of Fe@Fe3O4 NPs, (e) HRTEM image of the core-shell structure in Fig. 3(c), (f) HRTEM image of the Fe core, (g) TEM image of Fe-30, (h-k) elemental mappings of Fe-30.

Fig. 4. (a) Real (ε′) and (b) imaginary (ε”) parts of the permittivity of Fe-n.

Fig. 5. (a) Real (μ′) and (b) imaginary (μ”) parts of Fe-n permeability as functions of frequency.

Fig. 6. (a) Thickness-dependent RL-f curves of Fe-30, and (b) t-f curve of Fe-30 described by the quarter-wave formula.

Fig. 7. Schematic diagram of the interface cancellation model and derivation of the quarter-wave formula.

Fig. 8. Thickness-dependent RL-f curves of (a) Fe-40, (b) Fe-50, and (c) Fe-60.

Fig. 9. (a) 3D plot of the RL of Fe-60 as a function of thickness and frequency, (b) RL-f curve for a Fe-60 thickness of 1.96 mm, (c) RL projection of Fe-60 in the t-f plane, and (d) RL-f curve for a Fe-60 thickness of 1.52 mm.

Table 1 Representative microwave absorption data of some previously reported absorbers.

Absorber	Peak intensity (dB)	Peak frequency (GHz)	Frequency band (GHz)	Bandwidth (GHz)	Thickness (mm)	Reference
Fe-60	-39.46	11.10	9.49-13.39	3.90	1.96	This study
SiC	-16.23	11.47	10.55-12.40	1.85	1.90	[31]
NiCrAlY/Al₂O₃	-13.00	9.25	8.72-9.80	1.08	1.90	[32]
CNT/TiO₂	-32.14	10.33	9.22-12.00	2.78	2.00	[33]
Fe-60	-31.80	15.30	13.20-18.00	4.80	1.52	This study
RGO/MWCNT/ZnFe₂O₄	-19.20	15.00	13.75-16.37	2.62	1.50	[34]
C/N co-doped MoO₂	-25.00	16.82	14.40-18.00	3.60	1.50	[35]
Graphene@Ni@C	-34.20	13.90	12.00-15.20	3.20	1.60	[36]

Fig. 10. Effects of incidence angle on the RLmin of Fe-60 with a thickness of 1.52 mm for (a) TE and (b) TM waves.

Fig. 11. Effects of incidence angle on the bandwidth of Fe-60 with a thickness of 1.52 mm for (a) TE and (b) TM waves.

Fig. 12. Plots of frequency-dependent (a) dielectric loss angle tangent (tanδe) and (b) magnetic loss angle tangent (tanδm) for Fe-n.

Fig. 13. Plots of ε′ vs. ε” for (a) Fe-30, (b) Fe-40, (c) Fe-50, and (d) Fe-60.

Fig. 14. Plots of C = μ”(μ′)-2f-1 vs. f for Fe-n.

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