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Engineering Dielectric Loss of FeCo/Polyvinylpyrrolidone Core‐Shell Nanochains@Graphene Oxide Composites with Excellent Microwave Absorbing Properties
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-09-07 , DOI: 10.1002/adem.202000827 Erbiao Cui 1 , Fei Pan 2 , Zhen Xiang 2 , Zhicheng Liu 2 , Lunzhou Yu 1 , Juan Xiong 2 , Xiang Li 1 , Wei Lu 2
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-09-07 , DOI: 10.1002/adem.202000827 Erbiao Cui 1 , Fei Pan 2 , Zhen Xiang 2 , Zhicheng Liu 2 , Lunzhou Yu 1 , Juan Xiong 2 , Xiang Li 1 , Wei Lu 2
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FeCo alloy nanoparticles, as a kind of material with high saturation magnetization, have attracted wide attention in electromagnetic (EM) wave research. However, its application as a wave‐absorbing material is limited by its poor magnetic anisotropy and antioxidant properties. Herein, novel FeCo/Polyvinylpyrrolidone core‐shell nanochains@graphene oxide (GO) composites are successfully fabricated with superior microwave‐absorbing properties. The composites perform excellently in absorbing EM wave, with a strong reflection loss (RL) of −40.94 dB at 14.25 GHz, covering from 10.95 to 15.85 GHz (RL < −10 dB) with a matching thickness of 2.0 mm. The superior absorption properties are mainly attributed to the cooperation between amorphous magnetic FeCo nanoparticles and graphene, which contribute to the magnetic and dielectric loss, respectively. Moreover, the FeCo/PVP core‐shell morphology enhances the interfacial relaxation and surface chemical stability of the FeCo nanochains. Thus, this work provides a template for the new‐designed and facile‐synthesized EM wave‐absorbing material.
中文翻译：
FeCo /聚乙烯吡咯烷酮核壳纳米链@氧化石墨烯复合材料的工程介电损耗，具有优异的微波吸收性能
FeCo合金纳米粒子作为一种具有高饱和磁化强度的材料，在电磁波研究中引起了广泛的关注。但是，由于其磁各向异性和抗氧化性能差，其作为吸波材料的应用受到了限制。本文成功地制备了具有优异的微波吸收性能的新型FeCo /聚乙烯吡咯烷酮核壳纳米链@氧化石墨烯（GO）复合材料。该复合材料在吸收电磁波方面表现出色，在14.25 GHz时具有-40.94 dB的强反射损耗（RL），覆盖了10.95至15.85 GHz（RL <-10 dB），匹配厚度为2.0 mm。优异的吸收性能主要归因于非晶磁性FeCo纳米颗粒与石墨烯之间的协同作用，这分别有助于磁损耗和介电损耗。此外，FeCo / PVP核-壳形态增强了FeCo纳米链的界面弛豫和表面化学稳定性。因此，这项工作为新型设计且易于合成的EM吸波材料提供了模板。
更新日期：2020-09-07
中文翻译：
FeCo /聚乙烯吡咯烷酮核壳纳米链@氧化石墨烯复合材料的工程介电损耗，具有优异的微波吸收性能
FeCo合金纳米粒子作为一种具有高饱和磁化强度的材料，在电磁波研究中引起了广泛的关注。但是，由于其磁各向异性和抗氧化性能差，其作为吸波材料的应用受到了限制。本文成功地制备了具有优异的微波吸收性能的新型FeCo /聚乙烯吡咯烷酮核壳纳米链@氧化石墨烯（GO）复合材料。该复合材料在吸收电磁波方面表现出色，在14.25 GHz时具有-40.94 dB的强反射损耗（RL），覆盖了10.95至15.85 GHz（RL <-10 dB），匹配厚度为2.0 mm。优异的吸收性能主要归因于非晶磁性FeCo纳米颗粒与石墨烯之间的协同作用，这分别有助于磁损耗和介电损耗。此外，FeCo / PVP核-壳形态增强了FeCo纳米链的界面弛豫和表面化学稳定性。因此，这项工作为新型设计且易于合成的EM吸波材料提供了模板。
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