Synthesis and microwave electromagnetic properties of CoFe alloy nanoflakes prepared with hydrogen-thermal reduction method
Synthesis and microwave electromagnetic properties of CoFe alloy nanoflakes prepared with hydrogen-thermal reduction method
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DOI：
10.1063/1.3211987
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发表时间：
2009-09
影响因子：
3.2
通讯作者：
Y. Gong;L. Zhen;Jiantang Jiang;Chengyan Xu;W. Shao
中科院分区：
文献类型：
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作者：
Y. Gong;L. Zhen;Jiantang Jiang;Chengyan Xu;W. Shao
通过在 400 °C 下氢热还原 CoFe2O4 薄片 60 分钟，制备了直径和厚度为纳米级的 CoFe 合金纳米薄片（NF）。测量了 CoFe 合金 NFs/石蜡复合材料的有效复介电常数和磁导率，并与 CoFe 合金纳米颗粒（NPs）/石蜡复合材料进行了比较。由于二维形状特征，CoFe合金NF的介电常数和磁导率的实部比CoFe合金NP的要高。利用传输线理论评估了 CoFe 合金 NF 和 NP 的电磁波吸收（EMA）性能。研究发现，以CoFe合金纳米粒子为填料的涂层的有效EMA带位置位于2-4 GHz范围内，而以CoFe合金纳米粒子为填料的涂层的有效EMA带位置位于8-18 GHz范围内。在含有 CoFe 合金 NFs 作为填料的涂层中，最大反射损耗 (RLmax) 为 -57.8 dB，远高于...的 -16.6 dB。
CoFe alloy nanoflakes (NFs) with diameter and thickness on nanoscale were prepared by hydrogen-thermal reduction in CoFe2O4 flakes at 400 °C for 60 min. The effective complex permittivity and permeability of CoFe alloy NFs/paraffin composites were measured and compared with that of CoFe alloy nanoparticles (NPs)/paraffin composites. Due to the two-dimensional shape character, the real part of permittivity and permeability of CoFe alloy NFs was rather higher than that of CoFe alloy NPs. Electromagnetic wave absorbing (EMA) performance of both CoFe alloy NFs and NPs was evaluated by using transmission line theory. The effective EMA band position of the coating with CoFe alloy NFs as fillers was found to locate in the range of 2–4 GHz, while the effective EMA band position of the coating containing CoFe alloy NPs as fillers was located in the range 8–18 GHz. A maximum reflection loss (RLmax) of −57.8 dB was achieved in a coating containing CoFe alloy NFs as fillers, which is much higher than the −16.6 dB of ...