Facile synthesis and microwave absorption investigation of activated carbon@Fe(3)O(4) composites in the low frequency band.
Facile synthesis and microwave absorption investigation of activated carbon@Fe(3)O(4) composites in the low frequency band.
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活性炭@Fe3O4复合材料的简易合成及低频段微波吸收研究
DOI：
10.1039/c8ra04141e
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发表时间：
2018-06-21
期刊：
影响因子：
3.9
通讯作者：
Zhang, Yi
中科院分区：
文献类型：
--
作者：
Yin, Pengfei;Deng, Yu;Zhang, Limin;Li, Ning;Feng, Xing;Wang, Jian;Zhang, Yi
采用水热法合成了具有良好低频吸波性能的活性碳@Fe3O4复合材料。用X射线衍射仪、扫描电子显微镜、扫描电子显微镜、透射电子显微镜和矢量网络分析仪分别对所制备的复合材料的晶体结构、微观结构、磁化性能、频率电磁性能和微波吸收性能进行了表征。结果表明，通过添加活性碳可以调节复合材料的吸波性能。适当的Fe3O4纳米粒子在活性碳上的负载量也可以提高复合材料的微波吸收性能。介电损耗和磁损耗的协同作用是主要的电磁波吸收机制，当纳米Fe_3O_4含量为74wt%，复合材料厚度为5 mm时，在1.75 GHz处获得最大RL为10.08d B，在1.55 GHz(1.07~2.62 GHz)范围内−带宽为−5d B。因此，本研究所报道的复合材料在0.5-3 GHz的低频范围内是一种很有前途的微波吸收材料。
Activated carbon@Fe3O4 composites with good electromagnetic wave absorption performances in the low frequency range were synthesized via the hydrothermal method. The crystal structure, microstructure, magnetization properties, frequency-dependent electromagnetic properties and microwave absorption properties of the as-prepared composites were characterized via XRD, VSM, SEM, TEM and VNA, respectively. The results indicated that the electromagnetic wave absorption performance of the composites can be adjusted through the addition of activated carbon. A suitable loading content of Fe3O4 NPs on activated carbon can also enhance the microwave absorption performance of the composites. The synergy of dielectric and magnetic loss is the main electromagnetic wave absorption mechanism, and the maximum RL of −10.08 dB at 1.75 GHz with a −5 dB bandwidth over the frequency range of 1.55 GHz (1.07–2.62 GHz) is obtained when the percentage of Fe3O4 NPs and the thickness of the composites are 74 wt% and 5 mm, respectively. Hence, the composite reported in this study can be used as a promising microwave absorbing material in the low frequency range of 0.5–3 GHz.
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