期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 600, 期 -, 页码 382-389出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.05.055
关键词
Fe3O4/C; Interface; Polarization control; Microwave absorption
资金
- National Natural Science Foundation of China [51871078, 52071119]
- Heilongjiang Science Foundation [E2018028]
The study synthesized composite nanoparticles of Fe3O4 covered with ultra-thin carbon layer, which have large heterogeneous interfaces and can achieve high microwave absorption performance after interface regulation.
The sufficient interface contact in the composite absorbing material is beneficial to increase the dielectric loss and promote the microwave absorption performance. In this paper, the composite nanoparticles (NPs), Fe3O4 covered with ultra-thin carbon layer (Fe3O4/C), were synthesized by simple high temperature solution-phase and subsequent high-temperature steam carbonization methods. Small size Fe3O4/C composite NPs have large heterogeneous interfaces, which can control the polarization loss of composite NPs through the method of interface regulation and achieve high microwave absorption performance. The strongest reflection loss of the composite NPs with an average particle size of 52 nm can reach -58.5 dB at 14.88 GHz with a thickness of 2 mm, and the corresponding effective absorption (RL <= -1 0 dB) bandwidth (EAB) is 5.63 GHz (12.37-18 GHz). In particular, the high-efficiency absorption (RL <= -20 dB) bandwidth of Fe3O4/C can reach 15.44 GHz (2-17.44 GHz) with a thickness of 1.7-10 mm. The current method for controlling polarization loss provide a meaningful reference for future microwave absorption research. (C) 2021 Elsevier Inc. All rights reserved.
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