Nitrogen-doped graphene layer-encapsulated NiFe bimetallic nanoparticles synthesized by an arc discharge method for a highly efficient microwave absorber,Inorganic Chemistry Frontiers

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Nitrogen-doped graphene layer-encapsulated NiFe bimetallic nanoparticles synthesized by an arc discharge method for a highly efficient microwave absorber
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2020/02/10 , DOI: 10.1039/c9qi01577a
Xinghao Qu _{1,

2,

3,

4,

5} , Yuanliang Zhou _{1,

2,

3,

4,

5} , Xiyang Li _{1,

2,

3,

4,

5} , Muhammad Javid _{1,

2,

3,

4,

5} , Feirong Huang _{1,

2,

3,

4,

5} , Xuefeng Zhang _{6,

7,

8,

9} , Xinglong Dong _{1,

2,

3,

4,

5} , Zhidong Zhang _{9,

10,

11,

12,

13}

Affiliation

The development of inexpensive yet high-performance microwave absorbers to attenuate electromagnetic pollution stemming from the wide application of various electrical devices is of great significance. Magnetic NiFe alloys with relatively high permeability and multiple magnetic resonances are advantageous to broaden the absorption bandwidth. Benefiting from the coatings of carbon materials, the NiFe@C composites can efficiently increase the capability of oxidation/corrosion resistance. Meanwhile, the formation of numerous hetero-interfaces between C and NiFe alloys leads to interfacial polarization. However, it is still difficult to couple their relatively strong dielectric loss with magnetic loss, resulting in impedance mismatching. In this work, NiFe alloy nanoparticles embedded in nitrogen-doped graphene layers are successfully fabricated under a mixed gas of CH₄/N₂/Ar. By controlling the number of graphene layers and nitrogen doping level, the overall impedance can be effectively ameliorated. Experimental results indicate that the minimum reflection loss (R) can reach −46.89 dB at 11.96 GHz, accompanied by an effective absorption bandwidth of more than 4.1 GHz. Our work will advance the study of magnetic alloys/N-doped graphene composites for microwave absorption.

中文翻译：

电弧放电法合成氮掺杂石墨烯层包裹的NiFe双金属纳米粒子作为高效微波吸收剂

开发廉价而高性能的微波吸收器以减轻由于各种电气设备的广泛应用而引起的电磁污染具有重要意义。具有相对高的磁导率和多重磁共振的磁性NiFe合金有利于拓宽吸收带宽。受益于碳材料涂层，NiFe @ C复合材料可以有效地提高抗氧化/抗腐蚀能力。同时，在C和NiFe合金之间形成许多异质界面会导致界面极化。但是，仍然很难将它们相对较强的介电损耗与磁损耗耦合在一起，从而导致阻抗失配。在这项工作中₄ / N₂ / Ar。通过控制石墨烯层的数量和氮掺杂水平，可以有效地改善总阻抗。实验结果表明，在11.96 GHz时，最小反射损耗（ R）可以达到−46.89 dB，同时有效吸收带宽超过4.1 GHz。我们的工作将促进磁性合金/ N掺杂石墨烯复合材料对微波吸收的研究。

更新日期：2020-03-04

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