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Facile synthesis and excellent microwave absorption properties of FeCo-C core-shell nanoparticles

机译:FeCO-C核壳纳米粒子的容易合成和优异的微波吸收性能

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FeCo-C core-shell nanoparticles (NPs) with diameters of 10-50 nm have been fabricated on a large scale by one-step metal-organic chemical vapor deposition using the mixture of cobalt acetylacetonate and iron acetylacetonate as the precursor. The Fe/Co molar ratio of the alloy nanocores and graphitization degree of C shells, and thus the magnetic and electric properties of the core-shell NPs, can be tuned by the deposition temperature ranging from 700 degrees C to 900 degrees C. Comparative tests reveal that a relatively high Fe/Co molar ratio and low graphitization degree benefit the microwave absorption (MA) performance of the core-shell NPs. The composite with 20 wt% core-shell NP obtained at 800 degrees C and 80 wt% paraffin exhibits an optimal reflection loss (RL) of -60.4 dB at 7.5 GHz with a thickness of 3.3 mm, and an effective absorption bandwidth (frequency range for RL = 10 dB) of 9.2 GHz (8.8-18.0 GHz) under an absorber thickness of 2.5 mm. Our study provides a facile route for the fabrication of alloy-C core-shell nanostructures with high MA performance.
机译:通过使用甲丙基乙酸钴的混合物和乙酰丙酮作为前体的一步金属 - 有机化学气相沉积,通过一步金属 - 有机化学气相沉积来制造直径为10-50nm的FeCo-C核 - 壳纳米颗粒(NPS)。 C壳的合金纳米碱和石墨化度的Fe / Co摩尔比,从而可以通过700℃至900摄氏度的沉积温度调节核心 - 壳NP的磁性和电性能。比较试验揭示相对高的Fe / Co摩尔比和低石墨化程度有益于核心壳NP的微波吸收(MA)性能。具有800℃和80wt%石蜡的20wt%核 - 壳NP的复合材料在7.5GHz的最佳反射损失(RL),厚度为3.3mm,有效吸收带宽(频率范围)对于RL< = 10 dB),在吸收器厚度为2.5mm的吸收率下为9.2GHz(8.8-18.0GHz)。我们的研究提供了具有高MA性能的合金-C核壳纳米结构的容易途径。

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