Synergistic engineering of dielectric and magnetic losses in M-Co/RGO nanocomposites for use in high-performance microwave absorption
Synergistic engineering of dielectric and magnetic losses in M-Co/RGO nanocomposites for use in high-performance microwave absorption
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DOI：
10.1039/d0qm00461h
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发表时间：
2020-10-01
影响因子：
7
通讯作者：
Zhang, Yue
中科院分区：
文献类型：
--
作者：
Li, Qi;Zhang, Zheng;Zhang, Yue
阻抗匹配良好、衰减常数较高的微波吸收材料的发展仍然是一个挑战，这限制了其吸收性能的提高。因此，基于介电损耗和磁损耗协同工程的策略，利用阻抗匹配和衰减常数的协同效应，制备了具有增强微波吸收性能的磁性钴/还原氧化石墨烯(M-Co/RGO)纳米复合材料。RGO的介电损耗和M-Co纳米颗粒的磁损耗之间的协同工程提高了阻抗匹配和衰减常数，实现了改善微波吸收。通过调节M-Co/RGO纳米复合材料的质量比和填充量，其阻抗匹配常数和衰减常数分别可达0.95%和129.6，在11.7GHz处的最大反射损耗为-32.85dB。此外，在2.2 mm的厚度范围内，M-Co/RGO纳米复合材料的有效吸收带宽可调到8 GHz。M-Co/RGO纳米复合材料的介电损耗和磁损耗主要来源于偶极极化、界面极化和多重磁共振。毫无疑问，这种介电损耗和磁损耗协同工程的策略将为高性能吸波材料的设计提供新的见解。
The development of microwave absorption materials with well-matched impedance matching and higher attenuation constants still remains a challenge, and this restricts improvement in their absorption performance. Herein, magnetic cobalt/reduced graphene oxide (M-Co/RGO) nanocomposites with enhanced microwave absorption performance were tailored by utilizing the synergy of impedance matching and attenuation constant based on the strategy of synergistic engineering of dielectric and magnetic losses. The synergistic engineering between the dielectric loss of RGO and the magnetic loss of M-Co nanoparticles enhances the impedance matching and attenuation constant and realizes improved microwave absorption. Through tuning of the mass ratio and filler loading of M-Co/RGO nanocomposites, the impedance matching and attenuation constant can reach 0.95 and 129.6, respectively, and the maximum reflection loss of -32.85 dB is achieved at 11.7 GHz. Furthermore, the tunable effective absorption bandwidth of M-Co/RGO nanocomposites can reach 8 GHz within a thickness of 2.2 mm. The dielectric and magnetic losses of M-Co/RGO nanocomposites primarily originate from dipole polarization, interfacial polarization, and multiple magnetic resonances. Undoubtedly, this strategy for synergistic engineering of dielectric and magnetic losses will provide new insight into the design of high-performance microwave absorbents.