Construction of a three-dimensional rGO/CoFe 2 O 4 nanorods composite with enhanced microwave absorption performance
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Construction of a three-dimensional rGO/CoFe2O4 nanorods composite with enhanced microwave absorption performance Hanwen Zong1, Haibo Yang1,* Bo Wen1
, Jingjing Dong1, Liang Ma2, Ying Lin1,*, Yun Qiu1, and
1
Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China 2 Xianyang Non-metallic Mineral R & D Institute Co.,Ltd, Xianyang, China
Received: 1 July 2020
ABSTRACT
Accepted: 2 September 2020
Nowadays, designing and fabricating electromagnetic (EM) wave absorbers with lightweight and strong reflection loss (RL) is still urgent. Herein, rGO/ CoFe2O4 composite combined with magnetic CoFe2O4 nanorods and reduced graphene oxide (rGO) was fabricated via molten salt method in combination with a simple etching route. The EM absorption ability of rGO/CoFe2O4 nanorods composite can be regulated by changing the rGO addition amount. Particularly, the absorber for rGO/CoFe2O4 nanorods composite with the rGO addition amount of 70 mg (S-70) displays favorable EM wave absorption properties. The optimal RL value is - 56.3 dB at the frequency of 16.9 GHz, when the corresponding thickness is 1.4 mm. The effective absorption bandwidth (EAB, RL \ - 10 dB) is 4.3 GHz, when the thickness is 1.6 mm. Consequently, the rGO/CoFe2O4 nanorods composite is a potential candidate for microwave absorbing materials.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Due to the widespread use of communication devices and radar technology, EM radiation has become a tricky pollution question in many fields. It even has been regarded as a serious threat to electronic stability, healthcare and military fields [1–3]. So, it brings the great demand for developing high-performance EM wave absorbers which possess strong
absorption, wide absorption bandwidth, thin thickness and lightweight [4–6]. According to theoretical analysis and experimental verification, the EM absorption materials absorbing microwave energy is basically impacted by dielectric and/or magnetic loss [7–9]. However, materials with only one loss factor are hard to obtain excellent EM wave absorption properties owing to inappropriate impedance matching and limited loss mechanism [1, 10]. Therefore, through artificially adjusting the EM
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https://doi.org/10.1007/s10854-020-04402-7
J Mater Sci: Mater Electron
parameters, fabricating the magnetic/dielectric composites with strong absorption capacity, high efficiency and wide absorption frequency has become a credible strategy to obtain excellent EM wave absorbers [11–14]. rGO has drawn considerable attention owing to two-dimensional (2D) single-layer structure, large specific surface area, abundant residual defects and appropriate dielectric loss [15, 16], which may lead to excellent electrical conductivity, thermal and mechanical properties. Nevertheless, the EM wave absorptio
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