Fabrication and Microwave Absorption Properties of Core-Shell Structure Nanocomposite Based on Modified Anthracite Coal

• Published in: Nanomaterials (Basel, Switzerland) Switzerland), 2023-06, Vol.13 (12), p.1836
• Main Authors: Zhang, Xiaomei, Zhou, Baitong, Li, Xiang, Chen, Runhua, Ma, Chen, Chen, Wenhua, Chen, Guohua
• Format: Article
• Language: English
• Subjects: Absorption; Analysis; Anthracite; Anthracite coal; Carbon; Chemical reactions; Coal; Coal industry; Cobalt; Composite materials; Core-shell structure; Dielectric loss; Diels-Alder reaction; Electric waves; Electromagnetic radiation; Electromagnetic waves; Electronic countermeasures; Energy consumption; Fabrication; Graphene; Graphite; Graphitization; High temperature; Hydrochloric acid; Identification and classification; Iron; Lamellar structure; Methods; Methylamine; microwave absorbing performance; Microwave absorption; Morphology; Nanocomposites; Nanocrystals; Nanoparticles; Oxidation; Paraffin; Paraffin wax; Pore size; Properties; Spheres; Temperature
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano13121836

Microwave-absorbing materials have attracted extensive attention due to the development of electronic countermeasures. In this study, novel nanocomposites with core-shell structures based on the core of Fe-Co nanocrystals and the shell of furan methylamine (FMA)-modified anthracite coal (Coal-F) were designed and fabricated. The Diels-Alder (D-A) reaction of Coal-F with FMA creates a large amount of aromatic lamellar structure. After the high-temperature treatment, the modified anthracite with a high degree of graphitization showed an excellent dielectric loss, and the addition of Fe and Co effectively enhanced the magnetic loss of the obtained nanocomposites. In addition, the obtained micro-morphologies proved the core-shell structure, which plays a significant role in strengthening the interface polarization. As a result, the combined effect of the multiple loss mechanism promoted a remarkable improvement in the absorption of incident electromagnetic waves. The carbonization temperatures were specifically studied through a setting control experiment, and 1200 °C was proved to be the optimum parameter to obtain the best dielectric loss and magnetic loss of the sample. The detecting results show that the 10 wt.% CFC-1200/paraffin wax sample with a thickness of 5 mm achieves a minimum reflection loss of -41.6 dB at a frequency of 6.25 GHz, indicating an excellent microwave absorption performance.