Combination of pumpkin-derived biochar with nickel ferrite/FeNi 3 toward low frequency electromagnetic absorption
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Combination of pumpkin-derived biochar with nickel ferrite/FeNi3 toward low frequency electromagnetic absorption Pengfei Yin1,* , Limin Zhang2, Yuhang Wang3, Hanbing Rao1, Yanying Wang1, Jian Wang1, Xing Feng1, Yuting Tang1, Jianwu Dai4, and Hao Cheng5 1
College of Science, Sichuan Agricultural University, Ya’an 625014, People’s Republic of China School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710072, People’s Republic of China 3 School of Chemistry and Chemical Engineering, Shaanxi Xueqian Normal University, Xi’an 710100, People’s Republic of China 4 College of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya’an 625014, People’s Republic of China 5 College of Humanities, Sichuan Agricultural University, Ya’an 625014, People’s Republic of China 2
Received: 30 July 2020
ABSTRACT
Accepted: 17 August 2020
The rapid development of electromagnetic communication and electronic technique has brought serious problems of EMI and electromagnetic radiation. Herein, a combined method of ball milling, hydrothermal and multiple calcination processes was utilized to synthesize pumpkin-derived biochar/nickel ferrite/FeNi3 composite. The nickel ferrite and FeNi3 nanoparticles are distributed uniformly on the surface of biochar, and the thin carbon layer formed on the surface of NPs endows a better impedance matching to the particles. The excellent low frequency absorption performance can be achieved via the cooperative effect of dielectric and magnetic wastage mechanisms i.e., low frequency natural resonance, abundant interface polarization, dipolar polarization, conductive loss, multi-reflection and scatter etc. The maximum RL value achieves - 59.29 dB at 1.30 GHz with the effective absorption bandwidth of 1.34 GHz (0.76–2.1 GHz), declaring this biochar/nickel ferrite/FeNi3 ternary hybrid could be used as one kind of efficient low frequency electromagnetic absorbent.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Nowadays, the fast developing of electromagnetic communication and technique has brought fearful problems of electromagnetic interference (EMI) and electromagnetic radiation, which also menaces to the human health and the running of precision
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https://doi.org/10.1007/s10854-020-04285-8
electromagnetic instrument. Consequently, the electromagnetic absorption materials (EAMs) possessing strong absorbing ability in GHz frequency region have been put forward to address these problems [1–6]. Usually, the perfect absorber demands stronger absorption, lower density, wider bandwidth and thinner thickness, therefore, the carbon materials
J Mater Sci: Mater Electron
such as CNTs/MWCNTs [7–9], GO/RGO [10–12], CFs [13–15] etc. have been broadly applied in the electromagnetic absorbing field due to their ultralight feature and forceful dielectric wastage ability to the incident microwave. In recent years, the biochar derived from biomass shows great application p
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