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Facile Synthesis of [email protected]xSy@MoS2 Composites with Hierarchical Structures for Microwave Absorption

Department of Applied Chemistry, School of Natural and Applied Sciences, Northwestern Polytechnical University, Xi’an 710072, China
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Nanomaterials 2019, 9(10), 1403; https://doi.org/10.3390/nano9101403
Received: 18 September 2019 / Revised: 25 September 2019 / Accepted: 26 September 2019 / Published: 2 October 2019
Graphene-based powder absorbers have been used to attain excellent microwave absorption. However, it is not clear if inferior microwave absorption by pure graphene materials can be attributed to impedance mismatching or inadequate attenuation capability. In this comparative study, we focus on these aspects. Graphene nanoplatelets (GNPs) multi-component composites ([email protected]xSy@MoS2) were prepared by hydrothermal reaction with different S and Mo molar ratios. The morphologies, phase crystals, elemental composition, and magnetic properties of the composites were also analyzed. In addition, microwave absorption of the as-prepared samples was investigated and it revealed that the impedance mismatching could be responsible for inferior microwave absorption; higher conductivity can lead to skin effect that inhibits the further incidence of microwaves into the absorbers. Furthermore, the optimum reflection loss (RL) of [email protected]xSy@MoS2-2 can reach −43.3 dB at a thickness of 2.2 mm and the corresponding bandwidth with effective attenuation (RL < −10 dB) of up to 3.6 GHz (from 7.0 to 10.6 GHz). Compared with the GNPs, the enhanced microwave absorption can be assigned to the synergistic effects of conductive and dielectric losses. View Full-Text
Keywords: Microwave absorption properties; impedance matching; synergy effect; dielectric loss Microwave absorption properties; impedance matching; synergy effect; dielectric loss
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Zhu, W.; Zhang, L.; Zhang, W.; Zhang, F.; Li, Z.; Zhu, Q.; Qi, S. Facile Synthesis of [email protected]xSy@MoS2 Composites with Hierarchical Structures for Microwave Absorption. Nanomaterials 2019, 9, 1403.

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