期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 7, 期 23, 页码 18765-+出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b02913
关键词
Fe@Fe3C/C nanocomposite; Microwave absorbing; Biochar; Dielectric loss; Magnetic loss
资金
- National Natural Science Foundation of China [51601105, 51771104, 51871146, 51803119]
- Natural Science Foundation of Shandong Province [BS2015CL020]
- China Postdoctoral Science Foundation [2017M622199]
Carbon-based composites have shown excellent electromagnetic wave-absorption properties. In this work, an extremely facile and green method was developed to prepare Fe@Fe3C/C nanocomposites by carbonizing the bulrush impregnated with Fe(NO3)(3) solutions. The core-shell Fe@Fe3C was generated from carbothermal reductions and interfacial reactions. The minimum reflection loss exceeded -50 dB with absorbers thickness almost no more than 2.00 mm. The widest absorption bandwidth was up to 4.57 GHz with a thickness only 1.43 mm. Meanwhile, the absorption performance with RL < -10 dB could be observed in a bandwidth of about 15 GHz as absorbers thickness varied from 1.00 to 5.00 mm. The excellent wave-absorbing properties could be attributed to the synergistic effect of dielectric loss and magnetic loss of Fe@Fe3C/C nanocomposites. Also, the optimized impedance matching and high attenuation abilities of absorbers contributed to the absorption performance. This work provides a new way of recycling the abundant natural herbage waste to be used in electromagnetic applications.
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