期刊
MATERIALS TODAY PHYSICS
卷 27, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mtphys.2022.100801
关键词
Microemulsion phase conversion approach; Schottky barrier; Sulfur vacancies; Electromagnetic wave absorption
资金
- National Natural Science Foundation of China [51407134]
- Natural Science Foundation of Shandong Province [ZR2019YQ24]
- Taishan Scholars and Young Experts Program of Shandong Province [tsqn202103057]
- Qingchuang Talents Induction Program of Shandong Higher Education Institution (Research and Innovation Team of Structural-Functional Polymer Composites)
Structural engineering and component modulation are effective strategies for designing superior electromagnetic wave absorbing materials. In this study, different structures of dielectric microwave absorbing materials were designed using a microemulsion phase transition approach. The sensitivity to component modulation varied among the different structures, revealing the interplay between structure and components in attenuating electromagnetic waves.
Structural engineering and component modulation are effective strategies for designing superior electromagnetic wave (EMW) absorbing materials. The challenge of understanding the structure-component-property relationship and developing efficient microwave absorbers, however, remains a huge challenge. In this work, we demonstrate a microemulsion phase transition approach to the design of different structures of dielectric microwave absorbing materials. Three different structures of MoO2/C (MC) microspheres, solid, yolk-shell, and hollow can be prepared by regulating the ratio of the two phases of water and oil. The MoO2/MoS2/C (MSC) trilayer dielectric microspheres with Schottky barriers were prepared by a subsequent vulcanization process in which component modulation allowed the construction of multi-interfaces and vacancy engineering. The analysis reveals that the sensitivity of the different structures to component modulation varies considerably, mainly in the number of vacancies generated by the sulfidation process. This difference is determined by both the free space of the microspheres and the number of effective media. Such a phenomenon provides insight into the interplay between structure and components in attenuating EMW. Of these, with the 50% sulfated MoO2/MoS2/C yolk-shell microspheres (YSMSC) exhibiting a reflection loss (RL) of -80.73 dB at a thin thickness of 1.7 mm; the fully sulfated MoS2/C hollow microspheres (HMSC) achieve an effective absorption bandwidth (EAB) of 7.04 GHz at 2.2 mm. Our study contributes to an in-depth understanding of the structure-component-property relationship of EMW absorbers and provides a reference for tuning the product structure using microemulsion phase conversion methods.
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