Microwave absorption properties of SiC@SiO2@Fe3O4 hybrids in the 2–18 GHz range
来源期刊：International Journal of Minerals Metallurgy and Materials2017年第7期
论文作者：Peng Zhou Jun-hong Chen Meng Liu Peng Jiang Bin Li Xin-mei Hou
文章页码：804 - 813
摘 要：To enhance the microwave absorption performance of silicon carbide nanowires（SiCNWs）, SiO2 nanoshells with a thickness of approximately 2 nm and Fe3O4 nanoparticles were grown on the surface of SiCNWs to form SiC@SiO2@Fe3O4 hybrids. The microwave absorption performance of the SiC@SiO2@Fe3O4 hybrids with different thicknesses was investigated in the frequency range from 2 to 18 GHz using a free-space antenna-based system. The results indicate that SiC@SiO2@Fe3O4 hybrids exhibit improved microwave absorption. In particular, in the case of an SiC@SiO2 to iron（III） acetylacetonate mass ratio of 1:3, the microwave absorption with an absorber of 2-mm thickness exhibited a minimum reflection loss of-39.58 d B at 12.24 GHz. With respect to the enhanced microwave absorption mechanism, the Fe3O4 nanoparticles coated on SiC@SiO2 nanowires are proposed to balance the permeability and permittivity of the materials, contributing to the microwave attenuation.
Peng Zhou1，Jun-hong Chen2，Meng Liu2，Peng Jiang2，Bin Li3，Xin-mei Hou3
1. National Engineering Research Center for Advanced Rolling Technology,University of Science and Technology Beijing2. School of Material Science and Engineering,University of Science and Technology Beijing3. Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing
摘 要：To enhance the microwave absorption performance of silicon carbide nanowires（SiCNWs）, SiO2 nanoshells with a thickness of approximately 2 nm and Fe3O4 nanoparticles were grown on the surface of SiCNWs to form SiC@SiO2@Fe3O4 hybrids. The microwave absorption performance of the SiC@SiO2@Fe3O4 hybrids with different thicknesses was investigated in the frequency range from 2 to 18 GHz using a free-space antenna-based system. The results indicate that SiC@SiO2@Fe3O4 hybrids exhibit improved microwave absorption. In particular, in the case of an SiC@SiO2 to iron（III） acetylacetonate mass ratio of 1:3, the microwave absorption with an absorber of 2-mm thickness exhibited a minimum reflection loss of-39.58 d B at 12.24 GHz. With respect to the enhanced microwave absorption mechanism, the Fe3O4 nanoparticles coated on SiC@SiO2 nanowires are proposed to balance the permeability and permittivity of the materials, contributing to the microwave attenuation.
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