Iron cobalt/polypyrrole nanoplates with tunable broadband electromagnetic wave absorption
Iron cobalt/polypyrrole nanoplates with tunable broadband electromagnetic wave absorption
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DOI：
10.1039/c6ra16003d
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发表时间：
2016-09
期刊：
影响因子：
3.9
通讯作者：
Haicheng Wang;Zhiran Yan;J. An;Jun He;Yanglong Hou;Hongying Yu;Ning Ma;Guang-Hua Yu;
中科院分区：
文献类型：
--
作者：
Haicheng Wang;Zhiran Yan;J. An;Jun He;Yanglong Hou;Hongying Yu;Ning Ma;Guang-Hua Yu;
磁性纳米粒子（NPs）/导电聚合物纳米片由于其独特的物理特性，如强吸收、低密度和良好的抗氧化性，是先进电磁波吸收剂的潜在候选者。在这项工作中，通过改进的化学还原方法制备了铁钴纳米粒子（FeCo NPs），并通过原位化学氧化聚合合成了FeCo/聚吡咯（PPy）纳米片。纳米板表现出优异的电磁波吸收性能。当吸收体厚度为 2.15 mm 时，最大反射损耗 (RL) 在 13.40 GHz 处达到 -52.30 dB，有效吸收宽度 (RL < -10 dB) 位于大约 11.31–16.37 GHz。纳米复合材料的偶极极化、界面极化和空间电荷极化影响电磁波的介电损耗。此外，纳米复合材料的自然共振、交换共振和涡流损耗也会导致电磁波的磁损耗。纳米复合材料介电损耗和磁损耗的协同效应赋予FeCo/PPy纳米板优异的宽带电磁波吸收性能。
Magnetic nanoparticles (NPs)/conducting polymer nanoplates are great potential candidates for advanced electromagnetic wave absorbents due to their unique physical properties such as strong absorption, low density and good anti-oxidation. In this work, iron cobalt nanoparticles (FeCo NPs) were prepared by a modified chemical reduction method and FeCo/polypyrrole (PPy) nanoplates were synthesized by in situ chemical oxidative polymerization. The nanoplates exhibited an excellent electromagnetic wave absorbing performance. The maximum reflection loss (RL) reaches −52.30 dB at 13.40 GHz with an absorber thickness of 2.15 mm and the effective absorbing width (RL < −10 dB) is located at approximately 11.31–16.37 GHz. The dipole polarization, interface polarization and space-charge polarization of the nanocomposites contribute to the dielectric loss of the electromagnetic wave. Moreover, the natural resonance, exchange resonance and eddy current loss of the nanocomposites contribute to the magnetic loss of the electromagnetic wave. The synergetic effect of both the dielectric and magnetic losses of the nanocomposites endows the FeCo/PPy nanoplates with excellent broadband electromagnetic wave absorption.