Metal-organic-frameworks derived porous carbon-wrapped Ni composites with optimized impedance matching as excellent lightweight electromagnetic wave absorber
Metal-organic-frameworks derived porous carbon-wrapped Ni composites with optimized impedance matching as excellent lightweight electromagnetic wave absorber
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金属有机骨架衍生的多孔碳包裹镍复合材料具有优化的阻抗匹配，可作为优异的轻质电磁波吸收体
DOI：
10.1016/j.cej.2016.12.117
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发表时间：
2017-04-01
影响因子：
15.1
通讯作者：
Du, Youwei
中科院分区：
文献类型：
--
作者：
Liu, Wei;Shao, Qiuwen;Du, Youwei
近年来，金属-有机骨架复合材料，特别是嵌入多孔碳基体的磁性纳米颗粒，已成为一种很有前途的轻质电磁波吸收剂。然而，在微波吸收性能中阻抗匹配的优化研究还不够。在这项工作中，阻抗匹配进行了优化，以实现最强的吸收强度，并扩大了有效的频带宽度。通过改变碳化温度来控制电磁参数，实现最佳阻抗匹配。在500 ℃下合成的样品，厚度为2.6mm时，RL值为-51.8dB，有效带宽f（e）为3.48GHz;在600 ℃下合成的样品，厚度为1.8mm时，RL值为-15.0dB，有效带宽f（e）为4.72GHz。比较研究每个样品直接显示的RL性能和可能的衰减机制的阻抗匹配的效果进行了讨论。本文的工作加深了对阻抗匹配的理解，为高性能轻质吸波材料的合成奠定了基础。(C)2016爱思唯尔B. V.保留所有权利。
In recent years, metal-organic-frameworks derived composites, especially magnetic nanoparticles embedded in porous carbon matrix have emerged as promising candidate for lightweight electromagnetic wave absorber. Nevertheless, investigation on the optimization of impedance matching in the microwave absorption properties is insufficient. In this work, impedance matching is optimized to achieve strongest absorption intensity and broaden the effective frequency bandwidth. In detail, electromagnetic parameters have been controlled through changing the carbonization temperature to fulfill optimized impedance matching. RL value of -51.8 dB and an effective frequency bandwidth (f(e)) of 3.48 GHz with a thickness of 2.6 mm can be achieved by sample prepared at 500(circle)C and RL value of -15.0 dB and a f(e) of 4.72 GHz with a thin thickness of 1.8 mm can be reached by sample synthesized at 600(circle)C. Comparative studies of each sample directly display the effect of impedance matching on the RL performance and possible attenuation mechanisms are also discussed. This work may deepen the understanding of the impedance matching and pave the way for the synthesis of high performance lightweight microwave absorber. (C) 2016 Elsevier B.V. All rights reserved.