A facile synthesis of FeNi₃@C nanowires for electromagnetic wave absorber

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• 作者：Yuping Sun ; Xianguo Liu ; Chao Feng ; Jincheng Fan ; Yaohui Lv ; Yiran Wang ; Chengtao Li
• 关键词：Core&ndash ; shell ; Nanowires ; Hydrothermal synthesis ; Microwave absorption
• 刊名：Journal of Alloys and Compounds
• 出版年：15 February, 2014
• 年：2014
• 卷：586
• 期：Complete
• 页码：688-692
• 全文大小：1273 K

文摘

The present paper presents a facile hydrothermal method to synthesize FeNi₃@C nanowires by reducing Ni(NO₃)₂路6H₂O and Fe(NO₃)₂路9H₂O with hydrazine hydrate in ethanol and glucose solution. The FeNi₃@C nanowires have diameters ranging from 5 to 15 nm and length ranging from 150 to 250 nm, which are self assembled by FeNi₃@C nanocapsules with onion-like carbon shells. The electromagnetic properties of FeNi₃@C nanowires-paraffin composites have been investigated in detail. The Cole-Cole semicircle approach is adopted to explain the dielectric resonance, due to a cooperative consequence of the core/shell interfaces and the dielectric carbon shells. The coexistence of natural resonance and exchange resonance result in strong magnetic loss. For 2.0 mm thickness layer, an optimal reflection loss (RL) of 鈭?3.3 dB is observed at 9.91 GHz and RL exceeding 鈭?0 dB is obtained at 8.7-13.78 GHz. The absorbent with a thickness of 1.2 mm has a RL of 鈭?8.49 dB at 18.0 GHz. The FeNi₃@C nanowires can be a potential material for fabricating microwave devices, due to the synergy of dielectric loss and magnetic loss and the quarter-wavelength cancellation.