Mesoporous carbon decorated with FeCoNi/polyaniline/polypyrrole towards lightweight and efficient microwave absorption c
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Mesoporous carbon decorated with FeCoNi/polyaniline/ polypyrrole towards lightweight and efficient microwave absorption coating Yomen Atassi1,* 1 2
and Xu Fun2
Department of Applied Physics, Higher Institute for Applied Sciences and Technology, Damascus, Syria College of Chemistry and Environmental Science, Henan Normal University, Xinxiang, China
Received: 12 June 2020
ABSTRACT
Accepted: 16 October 2020
Herein, a novel microwave absorber, based on a hybrid material of mesporous carbon, FeCoNi alloy and coated with polyaniline/polypyrrole conductive copolymer, was prepared. The mesoporous carbon imparts lightweightness to the absorber, whereas FeCoNi and the copolymer render the magnetic and dielectric loss properties of the absorber, respectively. The absorber has been characterized with X-ray diffractometry, scanning and transmission electron microscopy, and vibrating sample magnetometer. The constitutive parameters of the samples were estimated using a vector network analyzer. The results indicate that the coating with the conductive copolymer enhances the matching impedance and decreases the matching thickness of the absorber. The minimum reflection loss is obtained around - 16 dB at the matching frequency of 14.2 GHz, and the bandwidth under - 10 dB is about 2.7 GHz for a loading percentage of 35wt% and a matching thickness of 2.5 mm.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction With the increasing number of telecommunication and electronic devices working at microwave frequencies, such as radars, mobile phones and local area networks, the electromagnetic interference (EMI) of the microwaves has become a serious challenge that needs to be addressed [1]. Moreover, the increased use of devices working at higher frequencies constitutes an elevated risk to human kind health [1, 2]. To cope with EMI problems, novel materials with high attenuation performance at the microwave
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https://doi.org/10.1007/s10854-020-04698-5
domain should be designed. The tailored microwave absorbers have to be cost-effective, lightweight with a large bandwidth [1, 2]. It is well admitted that the electromagnetic wave attenuation mechanism is linked to magnetic and dielectric losses inside the absorber. In this perspective, the investigation of novel microwave absorber using hybrid materials (inorganic and organic) with magnetic and dielectric loss, has become a trendy topic in the literature and solicited extensive research work [2, 3]. The synergistic effect of combining
J Mater Sci: Mater Electron
dielectric loss materials with magnetic loss ones was highlighted in recent research work [3]. Ferromagnetic resonance (FR) plays a primordial role when designing a new microwave absorber based on magnetic loss materials. A strong absorption peak takes place at the (FR) frequency. The position and the intensity of the resonance peak could be tuned by the composition of the active FR materials. Typically, these materials are metals
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