Three-dimensional porous manganese oxide/nickel/carbon microspheres as high-performance electromagnetic wave absorbers with superb photothermal property

材料科学 反射损耗 微波食品加热 碳化 石墨烯 吸收(声学) 多孔性 电磁辐射 衰减 纳米颗粒 氧化物 阻抗匹配 复合材料 光电子学 纳米技术 光学 电阻抗 冶金 复合数 扫描电子显微镜 工程类 物理 电气工程 量子力学
作者
Xiangwei Meng,Jing Qiao,Yunfei Yang,Xue Zhang,Zhengyi Yang,Sinan Zheng,Jiurong Liu,Lili Wu,Zhou Wang,Fenglong Wang
出处
期刊:Journal of Colloid and Interface Science [Elsevier BV]
卷期号:629: 884-894 被引量:62
标识
DOI:10.1016/j.jcis.2022.09.043
摘要

Regulating electromagnetic parameters and thus improving impedance matching characteristics by multi-component design is regarded as a prospective approach to obtain highly efficient electromagnetic wave absorption materials. Whereas, it is still challenging to fabricate microwave absorbers with strong absorption capacity and durability in harsh conditions. Based on the above considerations, three-dimensional porous multi-functional manganese oxide/nickel/carbon microspheres had been designed and prepared through a combined approach of facile solvothermal reactions and subsequent carbonization processes. The textural characteristic examinations demonstrated that, numerous manganese oxide and Ni nanoparticles of 15-20 nm in diameter were well dispersed in the carbon-based microspheres of approximately 0.8-1 μm in size. Microwave absorption property evaluation indicated that the minimum reflection loss reached up to -53.6 dB at 9.5 GHz, and effective absorption bandwidth of 3.7 GHz was achieved at matching thickness of merely 2.0 mm. The electromagnetic wave attenuation mechanisms analysis displayed that excellent impedance matching and various dissipation pathways, including magnetic loss, interfacial and dipole polarization relaxation synergistically contributed to the high microwave absorption performances of the porous composites. Radar cross-sectional simulation and photothermal measurements verified that the materials were supposed to have promising foregrounds in complicated circumstances.
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