Controllable construction design of Co@C@MWCNTs interpenetrating composite with tunable enhanced electromagnetic wave ab
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Controllable construction design of Co@C@MWCNTs interpenetrating composite with tunable enhanced electromagnetic wave absorption Yan Wang1,* 1
, Xiaochuang Di1, and Zhao Lu1
School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an 710021, People’s Republic of China
Received: 22 October 2020
ABSTRACT
Accepted: 11 November 2020
Lightweight absorbers with strong broadband microwave absorption are highly desired in military and civil fields. In this work, a 3D interpenetrating network formed from a Co@C@ MWCNTs composite was synthesized via a combined wet chemical and pyrolysis route. Because of strengthening interfacial polarization, suitable impedance matching and synergistic effects, the Co@C@MWCNTs hierarchical composite exhibited outstanding microwave absorption properties. An optimal reflection loss reached - 55.7 dB at 8.7 GHz and its effective bandwidth (RL \ - 10 dB) achieved 4 GHz (7.4–11.4 GHz) at an absorber thickness of 3 mm with a low filler content of 10 wt%. Furthermore, an effective bandwidth of 12.4 GHz (4.5–16.9 GHz) was obtained by varying the thickness from 2 to 4.5 mm. The superior microwave absorption performance originated from the enhanced interfacial polarization, multiple reflections, conductive network, synergistic effects and an improved impedance matching between Co–C and MWCNTs. This work provides a strategy to rationally design novel lightweight absorbers with strong microwave absorption.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction With the rapid development of wireless techniques and electronic technology, electromagnetic (EM) wave radiation gives rise to an increasing threat to human health and the environment [1, 2]. Therefore, considerable efforts have been made in exploring high-efficiency microwave absorption materials to reduce the risks of EM wave pollution by transforming EM energy into heat or other forms of
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https://doi.org/10.1007/s10854-020-04881-8
energies [3–5]. Both theoretical and experimental results have shown that adjusting EM wave parameters, attenuation constant, impedance matching and microstructure have been widely focused to promote the microwave absorption performances [6, 7]. Generally, the EM wave attenuation performance of a material depends on the complex permittivity and permeability, corresponding to dielectric loss and magnetic loss, respectively [8]. Among the abundant candidate materials, carbon materials, magnetic nanoparticles and metal–organic
J Mater Sci: Mater Electron
frameworks (MOFs) have been extensively studied, which is in favor of absorption and attenuation of EM waves [9–15]. However, the single loss mechanisms of absorbers exhibit poor microwave absorption performances due to weak impedance matching, which gives rise to reflection instead of absorption [16]. Currently, the combination of dielectric and magnetic components has received considerable interest because of the favorable impedance matching b
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