Synthesis of Flowerlike MoS2/CoNi Composites for Enhancing Electromagnetic Wave Absorption

doi:10.1007/s40195-021-01334-x

Abstract

Abstract:

The hierarchical MoS₂/CoNi composites were successfully synthesized by a two-step hydrothermal method. The large surface area of the MoS₂ enhances the dispersivity of the CoNi nanoparticles and the formation of abundant MoS₂/CoNi interfaces, which make an important contribution to the dielectric loss, and the introduction of the CoNi improves impedance matching and introduces magnetic loss, which can improve the absorption performance to electromagnetic waves. Through the calculation of the electromagnetic parameters, the minimum reflection loss (RL) value of the MoS₂/CoNi composites achieves -41.44 dB at 13.53 GHz under a thickness of 2.0 mm and the corresponding effective absorption bandwidth (RL below -10 dB) is 5.6 GHz. The MoS₂/CoNi composite has the potential to be applied to microwave absorption due to its strong absorption and wide bandwidth.

Key words: MoS2/CoNi composite, Microwave absorption, Interfacial polarization, Impedance matching

Fei Hu, Jingxiong Dai, Qi Liu, Zhiquan Zhang, Guangliang Xu. Synthesis of Flowerlike MoS₂/CoNi Composites for Enhancing Electromagnetic Wave Absorption[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(6): 890-900.

Figures/Tables 10

Fig. 1 Schematic illustration of the preparation procedure for MoS2/CoNi composites

Fig. 2 XRD patterns of MoS2 and MoS2/CoNi

Fig. 3 SEM images of S1 a, S2 b, S3 c, S4 d; TEM images of S1 e, S3 f; HRTEM images of S3 g; SEM images of S3 h and corresponding EDS elemental mapping images of Mo i, S j, Co k, Ni l

Fig. 4 Frequency dependence of electromagnetic parameters and loss tangent for the samples in 2-18 GHz: a ε′, b ε″, d μ′, e μ″, c dielectric loss tangent, f magnetic loss tangent

Fig. 5 Reflection loss and impedance matching curves within 2-18 GHz of the samples with different CoNi contents: S1 a, S2 b, S3 c, S4 d, and corresponding three-dimensional diagrams (e-h)

Fig. 6 Attenuation constants of the samples with different CoNi contents

Fig. 7 Reflection loss (RL) of the sample S3 with an absorbent thickness range of 1.6-2.6 mm a, comparison of the simulated and experimental thickness b

Fig. 8 Cole-Cole semicircle curve a and C0-f curve b of the sample S3

Table 1 Various previously reported MoS2 and CoNi-based absorbents materials and their microwave absorption performances

Materials	Loading ratio (wt%)	Thickness (mm)	Minimum RL (dB)	Bandwidth (GHz)	Ref.
MoS₂/C	30	1.4	-44.67	3.32	[20]
ppy@MoS₂	40	2.5	-25.0	6.41	[21]
MoS₂/Co₃O₄	40	4.0	-43.56	4.76	[22]
MoS₂@n-C@CoFe₂O₄	30	2.4	-46.7	3.5	[23]
CoNi	60	1.0	-33.0	2.96	[27]
CoNi@SiO₂/RGO	50	4.2	-46.3	2.6	[30]
CoNi@SiO₂@C	50	2.2	-46.0	5.6	[31]
MoS₂/CoNi	40	2.0	-41.44	5.6	This work

Fig. 9 Schematic diagram of microwave absorption mechanism for MoS2/CoNi composites

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Synthesis of Flowerlike MoS₂/CoNi Composites for Enhancing Electromagnetic Wave Absorption

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