科研之友
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摘要
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.
- 出版日期2018
- 单位南通大学
