Hollow double-shell structured Void@SiO2@Co-C composite for broadband electromagnetic wave absorption

Hollow double-shell structured Void@SiO2@Co-C composite for broadband electromagnetic wave absorption
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中空双壳结构Void@SiO2@Co-C复合材料用于宽带电磁波吸收

DOI:
10.1016/j.cej.2020.128093
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发表时间:
2020-12
影响因子:
15.1
通讯作者:
Yu Ronghai
Yu Ronghai
中科院分区:
工程技术1区
文献类型:
--
作者:
Liu Guiliang;Liu Xiaofang;Song Zhiming;Sun Xin;Li Ya;Shui Jianglan;Yu Ronghai

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目前的电磁波吸收材料普遍存在吸收带宽窄的问题,这是制约其实际应用的瓶颈。探索新的战略和设计新的体系结构来克服这一问题既紧迫又具有挑战性。本文通过金属有机骨架颗粒在中空二氧化硅空腔上的组装和热解,制备了由内空腔、中空SiO_2匹配壳和外壁Co-C多孔壳组成的中空双壳结构磁电复合材料。通过控制热解温度,可以很好地调节复合材料的多重磁共振、磁电界面极化、缺陷偶极子极化和电导率。尤其是空心二氧化硅空腔在改善阻抗匹配方面起着至关重要的作用。由于空心二氧化硅空腔、多孔碳壳和Co颗粒之间的协同作用,这种空洞@SiO_2@Co-C复合材料在2.2 GHz的厚度下具有7 GHz以上的宽有效吸收带宽,优于其他Co-C复合材料(小于6 GHz)。这项工作为拓宽EMW吸收带宽提供了有效的解决方案。
Current electromagnetic wave (EMW) absorbing materials generally face the problem of narrow absorption bandwidth, which is the bottleneck in practical applications. Exploring new strategies and designing new architectures to overcome this problem is urgent but challenging. Here, a hollow double-shell structured magneto-electric composite, composed of an internal hollow cavity, a middle SiO2matching shell and an outer Co-C porous shell (Void@SiO2@Co-C), was prepared by assembling metal–organic-framework particles on hollow SiO2cavity and pyrolysis. The multiple magnetic resonances, magneto-electric interface polarization, defect dipole polarization and conductivity of the composite can be well tuned by controlling the pyrolysis temperature. In particular, the hollow SiO2cavity plays an essential role in improving impedance matching. Benefitting from the synergistic effect between hollow SiO2cavity, porous carbon shell and Co particles, the Void@SiO2@Co-C composite exhibits a broad effective absorption bandwidth above 7 GHz at a thin thickness of 2.2 mm, which is superior to other Co-C composites (less than 6 GHz). This work provides an effective solution for broadening the EMW absorption bandwidth.
金属有机框架衍生的多级Co/C@V(2)O(3)空心球作为薄型、轻质、高效的电磁波吸收体
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