Rational construction and microwave absorption properties of porous FeOx/Fe/C composites
Rational construction and microwave absorption properties of porous FeOx/Fe/C composites
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多孔FeOx/Fe/C复合材料的合理结构及其微波吸收性能
DOI：
10.1016/j.jallcom.2020.154519
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发表时间：
2020-07
影响因子：
6.2
通讯作者：
Jiang Zhiyuan
中科院分区：
文献类型：
--
作者：
Chen Wenjiao;Zhao Hui;Xu Binbin;Jiang Qiaorong;Bao Susu;Jiang Zhiyuan
为了满足日益增长的军事和民用需求，有必要开发高效的微波吸收材料。本文以硝酸铁饱和滤纸为前驱体，采用热解法制备了FeOx/Fe/C复合材料。滤纸的三维纹理在热解过程中得到很好的保持。硝酸铁分解为Fe 2 O3，随后通过碳热还原还原为Fe 3 O 4和嵌入碳基质中的Fe纳米颗粒。热解过程中产生的各种气体会产生泡沫，并在碳基质中产生额外的纳米级孔隙。复合材料的化学组成和结构可以通过控制热解条件来定制。FeOx/Fe/C复合材料的吸波性能与其化学组成和结构密切相关。优化后的产品表现出优异的微波吸收性能：在2.0 mm的厚度下，最强反射损耗（RL）在12 GHz处为−37 dB;有效吸收带宽（RL < −10 dB）为6.5 GHz。优化产物的上级吸附性能是由于多种化学成分的协同作用、多级多孔结构和丰富的界面。该研究还提出了一种大规模合成高产量碳包覆磁性纳米颗粒的策略，用于高性能微波吸收材料。
To satisfy the growing demand for military and civil applications, it is necessary to develop high-efficiency microwave-absorbing materials. Herein, a pyrolysis process was developed to construct FeOx/Fe/C composites using filter papers saturated with ferric nitrate solution as the precursor. The three-dimensional textures of filter paper are well maintained during the pyrolysis process. Ferric nitrate is decomposed to Fe2O3and subsequently reduced to Fe3O4and Fe nanoparticles embedded in the carbon matrix via carbothermal reduction. Various gases produced during the pyrolysis process create foam and generate additional nanoscale pores in the carbon matrix. The chemical composition and structure of composites can be tailored by controlling the pyrolysis conditions. The microwave absorption properties of FeOx/Fe/C composites are closely related to the chemical composition and structure. The optimized product shows excellent microwave absorption properties: The strongest reflection loss (RL) is −37 dB at ∼12 GHz; the effective absorption bandwidth (RL < −10 dB) is 6.5 GHz with a thickness of 2.0 mm. The superior absorption properties of the optimized product can be ascribed to the synergies of multiple chemical components, hierarchically porous structures and abundant interfaces. This study also suggests a large-scale synthesis strategy for high-yield carbon-coated magnetic nanoparticles for high-performance microwave absorption materials.
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