期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 785, 期 -, 页码 765-773出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.01.271
关键词
ZIF 67; Graphene; Lightweight; Microwave absorption properties
资金
- National Natural Science Foundation of China [61701386, 51407134]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JQ5060]
- Natural Science Foundation of Shandong Province [ZR2016EEQ28]
Based on the EM wave absorption principle, superior absorbers should have the characteristics of strong attenuation constant and suitable impedance matching. In this work, a novel hierarchical composite consisting of Fe-Co nanoparticles embedded in porous carbon decorated with graphene (Fe-Co/NPC/RGO) was synthesized by a simple hydrothermal route using a Co metal organic framework (MOF) followed by calcination process. The microstructure, composition, magnetic properties and microwave absorption performances of as-synthesized samples were characterized and discussed. Compared with Fe-Co/NPC, the Fe-Co/NPC/RGO composite possessed high attenuation constant, excellent impedance matching and synergistic effect, which resulted in significant improvement in its microwave absorption properties. The optimal reflection loss (R-L) was -52.9 dB at 10.1 GHz for a thickness of 2.5 mm, and the corresponding absorption bandwidth (R-L < -10 dB) was almost 3.1 GHz (8.6-11.7 GHz). When the thickness was adjusted from 1.5 to 4 mm, the efficient absorption bandwidth (R-L < -10 dB, 90% absorption) was as high as 13.2 GHz (over frequency range of 4.8-18 GHz). The excellent absorption performance of Fe-Co/NPC/RGO derived from MOF provides a new route for the preparation of light-weight microwave absorbers with strong absorption and wide bandwidth. (C) 2019 Elsevier B.V. All rights reserved.
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