MOF-Derived Porous Co/C Nanocomposites with Excellent Electromagnetic Wave Absorption Properties
MOF-Derived Porous Co/C Nanocomposites with Excellent Electromagnetic Wave Absorption Properties
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MOF衍生的多孔Co/C纳米复合材料具有优异的电磁波吸收性能
DOI：
10.1021/acsami.5b03177
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发表时间：
2015-06-24
影响因子：
9.5
通讯作者：
Zheng, Lansun
中科院分区：
文献类型：
--
作者：
Lu, Yinyun;Wang, Yiting;Zheng, Lansun
将铁磁性金属纳米颗粒掺入高多孔碳基体的复合材料是一种很有前途的电磁波吸收材料。这种特殊的复合纳米材料有可能在受控气氛下通过金属有机框架（MOF）材料的热分解制备。本研究以Co- mof （Co- mof, ZIF-67）为例，通过成功制备多孔Co/C复合纳米材料，验证了该合成策略的可行性。MOF前驱体热分解的气氛和温度是多孔Co/C复合材料中铁磁性金属纳米颗粒和碳基体形成的关键因素。在不同温度下得到的3种Co/C复合材料中，500℃时得到的Co/C-500对电磁波的吸收性能最好。特别是Co/C-500的最大反射损耗（RL）达到-35.3 dB，有效吸收带宽（RL磅-10 dB）为5.80 GHz (8.40 GHz-14.20 GHz)，对应于吸收体厚度为2.5 mm。这种优异的电磁波吸收性能归因于高多孔结构与多组分之间的协同作用，显著提高了阻抗匹配。
Composites incorporating ferromagnetic metal nanopartices into a highly porous carbon matrix are promising as electromagnetic wave absorption materials. Such special composite nanomaterials are potentially prepared by the thermal decomposition of metal-organic framework (MOF) materials under controlled atmospheres. In this study, using Co-based MOFs (Co-MOF, ZIF-67) as an example, the feasibility of this synthetic strategy was demonstrated by the successful fabrication of porous Co/C composite nanomaterials. The atmosphere and temperature for the thermal decomposition of MOF precursors were crucial factors for the formation of the ferromagnetic metal nanopartices and carbon matrix in the porous Co/C composites. Among the three Co/C composites obtained at different temperatures, Co/C-500 obtained at 500 degrees C exhibited the best performance for electromagnetic wave absorption. In particular, the maximum reflection loss (RL) of Co/C-500 reached -35.3 dB, and the effective absorption bandwidth (RL pound -10 dB) was 5.80 GHz (8.40 GHz-14.20 GHz) corresponding to an absorber thickness of 2.5 mm. Such excellent electromagnetic wave absorption properties are ascribed to the synergetic effects between the highly porous structure and multiple components, which significantly improved impedance matching.