Lightweight and High-Performance Microwave Absorber Based on 2D WS2–RGO Heterostructures

Abstract

HIGHLIGHTS • WS 2-rGO nanosheets with ultra-small thicknesses and ultra-lightweight, were successfully prepared by a facile hydrothermal method. • The WS 2-rGO isomorphic heterostructures exhibited remarkable microwave absorption properties. ABSTRACT Two-dimensional (2D) nanomaterials are categorized as a new class of microwave absorption (MA) materials owing to their high specific surface area and peculiar electronic properties. In this study, 2D WS 2-reduced graphene oxide (WS 2-rGO) heterostructure nanosheets were synthesized via a facile hydrothermal process; moreover, their dielectric and MA properties were reported for the first time. Remarkably, the maximum reflection loss (RL) of the sample-wax composites containing 40 wt% WS 2-rGO was − 41.5 dB at a thickness of 2.7 mm; furthermore, the bandwidth where RL < − 10 dB can reach up to 13.62 GHz (4.38-18 GHz). Synergistic mechanisms derived from the interfacial dielectric coupling and multiple-interface scattering after hybridization of WS 2 with rGO were discussed to explain the drastically enhanced microwave absorption performance. The results indicate these lightweight WS 2-rGO nanosheets to be potential materials for practical electromagnetic wave-absorbing applications.

Sandwich-Like Fe&TiO2@C Nanocomposites Derived from MXene/Fe-MOFs Hybrids for Electromagnetic Absorption

“…Secondly, dielectric loss produced by the polarization of dipoles and interfaces among the Fe, TiO 2 , and carbon would give a great contribution to transform the EM energy into thermal energy. In detail, the Fe, TiO 2 nanoparticles, and carbon sheets with different conductivity could form capacitor-like structure, such as the contact positions of carbon sheets, the interfaces of Fe-TiO 2 , Fe-C, and TiO 2 -C. These capacitor-like structures could give rise to the accumulation and rearrangement of space charge, resulting in generating vast interface polarization processes in alternating EM field [3,75,76]. Thus, the interfacial polarization played a main role in the EM attenuation process for this sandwich-like Fe&TiO 2 @C ternary nanocomposite.…”

Synergetic dielectric loss and magnetic loss towards superior microwave absorption through hybridization of few-layer WS2 nanosheets with NiO nanoparticles

“…7d, EM waves can travel long distances with multi-reflected propagation paths inside the hybrids, resulting from the special layered structures of the WS 2 nanosheets [72]. Table 1 compares the EM wave absorption characteristics of some hybrid materials containing 2D materials reported in previous work [16,17,37,39,40]. It is found that the WS 2 /NiO hybrids with heterostructures prepared in this work have excellent EM wave absorption properties, as compared with other EMA materials.…”

“…The HRTEM image of the WS 2 / NiO hybrids is shown in Fig. 2e, and the interlayer spacing of approximately 0.62 and 0.24 nm could be indexed to the WS 2 and NiO crystallography planes, respectively [39,57].…”

“…Wang et al [38] successfully prepared MoS 2 -rGO hybrids that exhibited broad effective absorption bandwidths at low filler loadings and small thicknesses. Zhang et al [39] firstly synthesized a WS 2 /rGO composite by a facile hydrothermal method, which showed excellent EMA performance and a broadened EMA bandwidth. However, there are no reports regarding enhancement of the EMA performance of WS 2 through simultaneously increasing its dielectric loss and magnetic loss.…”

Microwave Absorption of Crystalline Fe/MnO@C Nanocapsules Embedded in Amorphous Carbon

“…As science and technology develop dramatically fast, electromagnetic radiation pollution has become a growing problem due to the explosive growth in the application of electronic devices, such as radar systems, local area networks, telephones, and computers. Overexposure to electromagnetic wave can not only affect the functioning of electronic equipment but also be potentially detrimental to human being and raise severe problems concerning the field of military applications [1][2][3]. Therefore, it has spurred internationally unprecedented interest in exploring microwave absorbing materials, which converts electromagnetic wave into energy in other forms [4,5].…”