材料科学
纳米花
反射损耗
微波食品加热
碳纳米管
复合材料
介电常数
介电损耗
电介质
电磁屏蔽
复合数
极化(电化学)
光电子学
纳米技术
纳米结构
电信
物理化学
化学
计算机科学
作者
Xiaojun Zeng,Guangming Jiang,Lingyu Zhu,Wei Wang,Meng Chen,Ronghai Yu
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2019-08-26
卷期号:2 (9): 5475-5482
被引量:47
标识
DOI:10.1021/acsanm.9b01076
摘要
Unsatisfactory reflection loss (RL) and thick thickness of the absorber severely limit the practical application of advanced electromagnetic (EM) microwave absorbers. Herein, we report a heterogeneous architecture that consists of Fe3O4 nanoflower, which construct from ultrathin nanosheets, and carbon nanotubes (CNTs) backbone to enhance their RL in low-thickness regions. Thanks to the reasonable structural design and dielectric loss regulation, the optimized Fe3O4/CNTs composites exhibit superior microwave absorbing properties. The minimal RL is −58.6 dB at 15.28 GHz. Meanwhile, the thickness is only 1.52 mm. Furthermore, when RL is below −10 dB, the actual absorption bandwidth is as high as 15 GHz at absorber thickness below 5 mm. The effective permeability (μr), permittivity (εr), and Z values indicate that the remarkable microwave absorption is attributable to the coordination of the excellent polarization relaxation of CNTs, the good intrinsic magnetic properties of Fe3O4 nanoflower, and the abundant interfacial polarization between Fe3O4 and CNTs.
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