Enhanced microwave absorption property of bowl-like Fe3O4 hollow spheres/reduced graphene oxide composites
Enhanced microwave absorption property of bowl-like Fe3O4 hollow spheres/reduced graphene oxide composites
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DOI：
10.1063/1.3691527
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发表时间：
2012-04-01
影响因子：
3.2
通讯作者：
Yang, Ruey-Bin
中科院分区：
文献类型：
--
作者：
Xu, Huai-Liang;Bi, Hong;Yang, Ruey-Bin
采用溶剂热法制备了一种新型的Fe 3 O 4空心球/还原氧化石墨烯（r-GO）复合材料。扫描电子显微镜和透射电子显微镜的图像显示，碗状的Fe 3 O 4空心球的平均外径为395 nm，壳层厚度为100 nm的装饰两侧的r-GO片。拉曼光谱中D峰和G峰的共存证实了r-GO态的存在，复合材料的D/G强度比的增加表明由于Fe 3 O 4空心球锚定在表面上，r-GO片层中的无序度显著增加。与原始r-GO、纯Fe 3 O 4纳米颗粒和报道的固体纳米Fe 3 O 4/r-GO相比，在2-18 GHz的频率范围内实现了更宽和更强的吸收。特别地，含有30重量%的样品具有2.0 mm涂层厚度的合成的中空Fe 3 O 4/r-GO在12.9 GHz处表现出24 dB的最大吸收以及对应于-10 dB处的反射损耗的4.9 GHz（从频率10.8-15.7 GHz）的带宽。测得的复相对介电常数和磁导率的数据表明，增强的微波性能是由一个主要的改善介电损耗和一个较小的磁损耗所造成的中空Fe 3 O 4的r-GO的结合。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.3691527]
A novel kind of Fe3O4 hollow spheres/reduced graphene oxide (r-GO) composites has been synthesized by a facile solvothermal method. The scanning electron microscopy and transmission electron microscopy images show bowl-like Fe3O4 hollow spheres with an average outer diameter of 395 nm and a shell thickness of 100 nm decorating on the both sides of r-GO sheets. The co-existence of both D and G peaks in Raman spectra confirms the presence of r-GO state, and an increased D/G intensity ratio of the composites suggests a substantial increase in disorder degree in the r-GO sheets due to the Fe3O4 hollow spheres anchoring on the surface. Compared to pristine r-GO, pure Fe3O4 nanoparticles, and the reported solid nano-Fe3O4/r-GO, both a wider and stronger absorption have been achieved in the frequency range of 2-18 GHz. In particular, the sample containing 30 wt.% as-synthesized hollow Fe3O4/r-GO with a coating layer thickness of 2.0 mm exhibits a maximum absorption of 24 dB at 12.9 GHz as well as a bandwidth of 4.9 GHz (from frequency of 10.8-15.7 GHz) corresponding to reflection loss at -10 dB. The measured complex relative permittivity and permeability data reveal that the enhanced microwave properties are contributed by a major improved dielectric loss and a minor magnetic loss resulting from the incorporation of hollow Fe3O4 on r-GO. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3691527]