Activated carbon fiber/Fe(3)O(4) composite with enhanced electromagnetic wave absorption properties.
Activated carbon fiber/Fe(3)O(4) composite with enhanced electromagnetic wave absorption properties.
复制标题
具有增强电磁波吸收性能的活性炭纤维/Fe3O4复合材料
DOI：
10.1039/c8ra05872e
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发表时间：
2018-10-10
期刊：
影响因子：
3.9
通讯作者：
Zhang, Guangyu
中科院分区：
文献类型：
--
作者：
Sun, Qilong;Sun, Lei;Cai, YingYing;Ji, Tao;Zhang, Guangyu
To obtain a low-density material that is capable of absorbing electromagnetic waves over a wide bandwidth, an activated carbon fiber/Fe3O4 composite material (ACF/Fe3O4) was prepared using an in situ reduction method. Scanning electron microscopy images show that Fe3O4 nanoparticles, approximately 10–40 nm in size, were spread uniformly over the surface of the ACF. The resulting composite exhibited superparamagnetic behavior at room temperature. The ability of the ACF and ACF/Fe3O4 composite to absorb electromagnetic waves over a frequency range of 8.2–18 GHz was measured using the arch method. The results showed that the maximum reflectivity of an ACF felt was −12.9 dB at 18 GHz, and the effective microwave-absorbing bandwidth (R < −10 dB) was 1.9 GHz (16.10–18 GHz). The absorption performance of the ACF was greatly enhanced by being loaded with Fe3O4 nanoparticles; the maximum reflectivity of the 2 mm layer of the ACF/Fe3O4 composite was −30.07 dB at 16.45 GHz, and the effective bandwidth (R < −10 dB) increased to 8.62 GHz (9.38–18 GHz). Coating with nano-Fe3O4 magnetic particles can effectively improve the absorption of electromagnetic waves by the ACF, and this technique therefore has great potential for application to the field of electromagnetic shielding.
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