Polarization enhancement of microwave absorption by increasing aspect ratio of ellipsoidal nanorattles with Fe3O4 cores and hierarchical CuSiO3 shells.
Polarization enhancement of microwave absorption by increasing aspect ratio of ellipsoidal nanorattles with Fe3O4 cores and hierarchical CuSiO3 shells.
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DOI：
10.1039/c4nr00158c
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发表时间：
2014-05
期刊：
影响因子：
6.7
通讯作者：
Junjie Xu;Jiwei Liu;R. Che;C. Liang;M. Cao;Yong Li;Zhengwang Liu
中科院分区：
文献类型：
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作者：
Junjie Xu;Jiwei Liu;R. Che;C. Liang;M. Cao;Yong Li;Zhengwang Liu
纳米结构的形状各向异性是影响其微波吸收性能的关键因素之一。研究了不同长径比的椭球形Fe3O4@CuSiO3纳米柱的微波吸收性能。结果表明，与球形Fe3O4@CuSiO3相比，长径比为3-4的椭球形纳米柱的微波吸收强度提高了约20%。一般情况下，随着纵横比从2.0增加到3.5，微波吸收峰从-20 dB单调增加到-30 dB。结果表明，长径比越大的椭球形纳米柱，其介电常数的真实的部分呈现出较高的介电常数和双共振峰，从而提高了微波吸收性能。我们的研究为理解纳米晶格对微波吸收性能的各向异性效应提供了见解。
The shape anisotropy of the nanostructured nanorattles is one of the key factors that affect their microwave absorption performance. In the present study, the microwave absorption performance of ellipsoidal Fe3O4@CuSiO3 nanorattles with different aspect ratios was investigated. Results demonstrated that the ellipsoidal nanorattles with the aspect ratio of 3-4 exhibited about 20% enhancement of microwave absorption intensity compared with spherical Fe3O4@CuSiO3. Generally, as the aspect ratio increased from 2.0 to 3.5, the microwave absorption peak was enhanced monotonously from -20 dB to -30 dB. It was found that the ellipsoidal nanorattles with larger aspect ratio exhibited higher coercivity and double resonance peaks of the real part of complex permittivity, resulting in the improvement of microwave absorption performance. Our research gives insights into the understanding of the anisotropic effect of nanorattles on microwave absorption performance.