Combination strategy of large interlayer spacing and active basal planes for regulating the microwave absorption performance of MoS2/MWCNT composites at thin absorber level
文献类型： 外文期刊
作者： Geng, Haoran 1 ; Guo, Yi 1 ; Zhang, Xuan 1 ; Zhang, Yang 1 ; Wang, Xuelin 1 ; Zhao, Pengfei 3 ; Wang, Guizhen 2 ; Liao, Jianhe 2 ; Dong, Lijie 1 ;
作者机构： 1.Wuhan Univ Technol, Hainan Inst, Sanya 572000, Peoples R China
2.Hainan Univ, Sch Mat Sci & Engn, Haikou 570208, Peoples R China
3.Chinese Acad Trop Agr Sci, Agr Prod Proc Res Inst, Key Lab Trop Crop Prod Proc, Minist Agr & Rural Affairs, Zhanjiang 524001, Peoples R China
关键词： Molybdenum disulfide; Multi-walled carbon nanotubes; Sulfur-vacancies; Lattice-oxygen; High-performance absorbers
期刊名称：JOURNAL OF COLLOID AND INTERFACE SCIENCE （ 影响因子：9.9； 五年影响因子：8.4 ）
ISSN： 0021-9797
年卷期： 2023 年 648 卷
页码：
收录情况： SCI
摘要： Recently, molybdenum disulfide (MoS2)/carbon has become a promising candidate for efficient microwave absorption. However, it is still challenging to simultaneously optimize the synergy of impedance matching and loss capability at the level of a thin absorber. Here, a new adjustment strategy is proposed by changing the concentration of precursor L-cysteine for MoS2/multi-walled carbon nanotubes (MWCNT) composites to unlock the basal plane of MoS2 and expand the interlayer spacing from 0.62 nm to 0.99 nm, leading to improved packing of MoS2 nanosheets and more active sites. Therefore, the tailored MoS2 nanosheets exhibit abundant sulfur -vacancies, lattice-oxygen, more metallic 1T-phase, and higher surface area. Such sulfur-vacancies and lattice -oxygen promote the electronic asymmetric distribution at the solid-air interface of MoS2 crystals and induce stronger microwave attenuation through interface/dipole polarization, which is further verified by first -principles calculations. In addition, the expansion of the interlayer spacing induces more MoS2 to deposit on the MWCNT surface and increases the roughness, improving the impedance matching and multiple scattering. Overall, the advantage of this adjustment method is that while optimizing impedance matching at the thin absorber level, composite still maintains a high attenuation capacity, which means enhancing the attenuation performance of MoS2 itself offsets the weakening of the composite's attenuation ability caused by the decrease in the relative content of MWCNT components. Most importantly, adjusting impedance matching and attenuation ability can be easily implemented by separate control of L-cysteine content. As a result, the MoS2/MWCNT composites achieve a minimum reflection loss value of-49.38 dB and an effective absorption bandwidth of 4.64 GHz at a thickness of only 1.7 mm. This work provides a new vision for the fabrication of thin MoS2-carbon absorbers.
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