期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 822, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.153666
关键词
Co/N-co-doped; Three-dimensional hierarchical pores; Absorption promoting nanostructures; Cooperative effect; Microwave absorption
资金
- National Natural Science Foundation of China [21676039]
- State Key Laboratory of Bio-Fibers and Eco-Textiles [2017kfkt12]
- Innovative talents in Liaoning universities and colleges [LR2017045]
In order to solve the pollution of electromagnetic interference (EMI), hierarchical Co/N-co-doped carbonaceous compounds with absorption promoting nanostructures were prepared as absorbing materials via a seaweed-based hydrogel strategy. XRD, Raman, SEM, TEM, VSM and XPS were used to characterize the resultant samples. All the tests indicated that the absorber carbonized at 700 degrees C (SA/N-CoxOy-700, among, SA represents sodium alginate and 700 means that the carbonization temperature was 700 degrees C) has an excellent performance, which minimal RL can reach to -47.31 dB at 16.16 GHz and the effective absorption bandwidth (RL < -10 dB) is 4.56 GHz from 13.44 to 18 GHz. The relative superior performance is mainly attributed to the cooperative effect of nitrogen-doped carbon skeleton, expanded surface, multiple defects, various phase interface and hierarchal pore structures, thus leading to the improvement in multiple reflections and scattering, nature resonance, eddy-current effect, the consumption of thermal energy, dipoles and interfacial polarization. (C) 2020 Elsevier B.V. All rights reserved.
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