Facile preparation, high microwave absorption and microwave absorbing mechanism of RGO–Fe3O4 composites
Facile preparation, high microwave absorption and microwave absorbing mechanism of RGO–Fe3O4 composites
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DOI：
10.1039/c3ra43359e
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发表时间：
2013-10
期刊：
影响因子：
3.9
通讯作者：
M. Zong;Ying Huang;Yang Zhao;Xu Sun;Chunhao Qu;Luo Didi;Jiangbo Zheng
中科院分区：
文献类型：
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作者：
M. Zong;Ying Huang;Yang Zhao;Xu Sun;Chunhao Qu;Luo Didi;Jiangbo Zheng
采用一锅法制备了还原氧化石墨烯（RGO）-Fe3O4复合材料，该复合材料具有明显的微波吸收性能，且避免了惰性气体和任何化学试剂（如表面活性剂和稳定剂）的使用。鉴于这些优点，在这项研究中描述的策略可以开发为一个简单的和大规模的路线，以产生RGO-Fe3O4复合材料。采用XRD、XPS、TEM、FT-IR、拉曼、TG和VSM等手段对复合材料的形貌、结构、热稳定性、磁性和微波电磁性能进行了表征。这些复合材料表现出优异的微波吸收性能，这归因于介电损耗和磁损耗之间的有效互补。研究了RGO-Fe_3O_4复合材料的吸波机理。对于厚度为3.9 mm的RGO-Fe3O4 - 3复合材料，在6.6 GHz处的RL最大值达到-44.6 dB，RL小于-10 dB的带宽可达4.3 GHz（从12.2到16.5 GHz），厚度为2.0 mm。此外，通过改变样品的（RGO）/（Fe3 O4）比和层厚度，可以很容易地调节微波吸收性能。这种复合材料在微波吸收领域具有广阔的应用前景。
Reduced graphene oxide (RGO)–Fe3O4 composites with obviously enhanced microwave absorption properties were successfully fabricated by a rational one-pot simplified co-precipitation route, which avoided the usage of an inert gas and any additional chemical agents (such as surfactants and stabilizers). Given these advantages, the strategy described in this study can be developed as a simple and large-scale route to yield RGO–Fe3O4 composites. The morphology, structure, thermal stability, magnetic and microwave electromagnetic properties of the as-prepared composites were characterized by XRD, XPS, TEM, FT-IR, Raman, TG and VSM. These composites exhibit excellent microwave absorption properties, which are attributed to effective complementarities between the dielectric loss and the magnetic loss. The microwave absorption mechanism of the RGO–Fe3O4 composites was studied in detail. For the RGO–Fe3O4-3 composite, the maximum RL reaches −44.6 dB at 6.6 GHz with a thickness of 3.9 mm, and the bandwidth of RL less than −10 dB can reach up to 4.3 GHz (from 12.2 to 16.5 GHz) with a thickness of 2.0 mm. Moreover, the microwave absorption properties can be tuned easily by varying the (RGO)/(Fe3O4) ratio and layer thickness of the samples. It is believed that such composites will find wide applications in the microwave absorbing area.