纳米棒
材料科学
微波食品加热
反射损耗
各向异性
多孔性
制作
纳米结构
共振(粒子物理)
纳米颗粒
散射
复合材料
光电子学
纳米技术
光学
复合数
医学
物理
替代医学
病理
量子力学
粒子物理学
作者
Chao Wang,Nankun Chen,Yiyao Xiao,Jiahao He,Rui Han,Ningning Song
标识
DOI:10.1016/j.ceramint.2023.08.304
摘要
Fe3O4@SiO2 composites with different morphologies (hollow nanorods, porous nanorods, and flower-like nanoparticles) were constructed using different preparation methods. Considerably enhancement of resonance frequency and permeability beyond Snoek’s limitation were observed in the Fe3O4@SiO2 composites with shape anisotropy and porous core-shell nanostructure. The resonance frequency of porous Fe3O4@SiO2 nanorods enhanced to 4.21 GHz, which is much higher than the natural resonance frequency of 1.2 GHz for Fe3O4 bulk. The minimum reflection loss (RLmin) of Fe3O4@SiO2 porous nanorods reached -59.49 dB at 8.89 GHz, and its effective bandwidth (RL < -10 dB) covered 4.52 GHz at a thickness of 3.18 mm. In addition, the radar scattering cross section (RCS) reduction value reached more than 48 dBm2 after removing the background. Our study provides insight into the relationship between anisotropy, core-shell structure, morphology of nanoparticles and corresponding microwave performance, and provides a reference scheme for the fabrication of high-performance lightweight microwave absorbing materials.
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