期刊
CHEMICAL ENGINEERING JOURNAL
卷 384, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123266
关键词
Reduced graphene oxide; Nitrogen doping; Nickel-zinc ferrite; Composites; Microwave absorption
资金
- Foundation of Provincial Natural Science Research Project of Anhui Colleges [KJ2019A0119, KJ2017ZD09]
- China Postdoctoral Science Foundation [2019M652160]
- National Natural Science Foundation of China [51507003]
- Lift Engineering of Young Talents and Doctor's Start-up Research Foundation of Anhui University of Science and Technology [ZY537]
Nowadays, developing high-performance microwave absorbers with thin thickness, strong absorbing, broad bandwidth and low filler loading is of great importance for solving the problem of electromagnetic pollution. Herein, nitrogen-doped reduced graphene oxide/nickel-zinc ferrite (NRGO/Ni0.5Zn0.5Fe2O4) composite was synthesized using graphene oxide (GO) as a template by a facile two-step strategy. Results of morphology observations revealed that well-designed entanglement structure consisting of Ni0.5Zn0.5Fe2O4 microspheres and crumpled NRGO was clearly observed in the as-prepared NRGO/Ni0.5Zn0.5Fe2O4 composite. Moreover, the effects of complexing of NRGO and filler loadings on the microwave absorption properties of NRGO/Ni(0.5)Zn(0.5)Fe(2)O(4)4 composite were carefully investigated. It was found that the complexing of NRGO notably enhanced the microwave absorption properties of Ni0.5Zn0.5Fe2O4 microspheres. Significantly, the obtained NRGO/Ni0.5Zn0.5Fe2O4 composite demonstrated the optimal minimum reflection loss of - 63.2 dB with a matching thickness of 2.91 mm in the X-band and effective absorption bandwidth of 5.4 GHz (12.0-17.4 GHz) almost covering the whole Ku-band with a thin thickness of merely 2.0 mm. Furthermore, the relationship between filler loading and refection loss was carefully clarified. Besides, the underlying microwave absorption mechanisms of as-prepared composite were proposed. It was believed that our results could shed light on the design and fabrication of graphene-based magnetic composites as high-efficient microwave absorbers.
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