反射损耗
材料科学
微观结构
微波食品加热
碳纤维
纳米颗粒
吸收(声学)
钴
化学工程
热解
介电损耗
复合材料
电介质
纳米技术
复合数
冶金
光电子学
物理
工程类
量子力学
作者
Binhua Han,Wei Chu,Xijiang Han,Ping Xu,Dawei Liu,Liru Cui,Yahui Wang,Honghong Zhao,Yunchen Du
出处
期刊:Carbon
[Elsevier]
日期:2020-07-21
卷期号:168: 404-414
被引量:110
标识
DOI:10.1016/j.carbon.2020.07.005
摘要
Rational optimization on chemical composition and microstructure is a hot topic for magnetic carbon-based composites to overcome their challenges in microwave absorption. In this study, we demonstrate the synthesis of uniform Co/C microspheres with tunable chemical composition through a solvothermal reaction followed by high-temperature pyrolysis. It is found that this simple strategy greatly benefits from the dual functions of glucose. On one hand, glucose is the source of gluconate as the organic ligand to complex with Co ions and produce uniform Co-gluconate microspheres, and on the other hand, glucose can be converted into carbon nanoparticles and accommodated in Co-gluconate microspheres. The final Co/C microspheres display quite different electromagnetic properties as compared with pure metal Co particles. The presence of carbon component and high dispersion of Co nanoparticles induce positive reinforcements in both dielectric loss and magnetic loss. As a result, these Co/C microspheres can produce better microwave absorption performance, especially for Co/C-1.0 (the weight ratio of glucose to cobalt nitrate is 1.0), whose strong reflection loss and wideband response are also superior to those similar composites in previous reports. It is believable that this work may provide a new strategy for magnetic carbon-based composites with desirable microstructure and chemical composition.
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