The optimization of hydrothermal process of MoS_2 nanosheets and their good microwave absorption performances |
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| Institution: | 1. College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China;2. College of Aeronautics and Astronautics, National University of Defense Technology, Changsha 410073, China;1. School of Materials Science & Engineering, Xi’an Polytechnic University, Xi’an 710048, China;2. School of Textile Science and Engineering, Xi’an Polytechnic University, Xi’an 710048, China;1. Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;2. Beijing Key Laboratory of Environmentally Harmful Chemicals Analysis, School of Science, Beijing University of Chemical Technology, Beijing 100029, China;1. Key Laboratory for Anisotropy and Texture of Materials (MOE), School of Materials Science and Engineering, Northeastern University, Shenyang, People''s Republic of China;2. Innovative Center for Advanced Materials, Hangzhou Dianzi University, Hangzhou, 310012, People''s Republic of China |
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| Abstract: | In this study, flower-like MoS2 constructed by nanosheets was synthesized by a simple hydrothermal method. The hydrothermal process was optimized and the effects of hydrothermal condition, including reaction temperature, reaction time and the ratio of Mo source to S source (Mo:S) in precursor, on microwave absorption performances and dielectric properties were investigated. Our results showed that when the reaction temperature was 180 °C, the reaction time was 18 h, and the Mo:S was 1:3.5, the synthesized MoS2 had the best performance: Its minimum reflection loss could reach −55.78 dB, and the corresponding matching thickness was 2.30 mm with a wide effective bandwidth of 5.17 GHz. Further researches on the microwave absorption mechanism revealed that in addition to the destructive interference of electromagnetic waves, various polarization phenomena such as defect dipole polarization were the main reasons for microwave loss. We believe that MoS2 is a candidate for a practical microwave absorbent. |
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| Keywords: | Hydrothermal preparation Microwave absorption performance Process optimization Microwave absorption mechanism |
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