Abstract
The advanced electromagnetic applications urgently require high performance absorbers with sophisticated structural and compositional design. An effective strategy is to construct a three-dimensional hollow structure, with enhanced electromagnetic wave dissipation capacity over a wide effective absorption bandwidth. However, a major challenge remains due to a single loss mechanism system derived from the conventional hollow nanobox structure, which seriously causes impedance mismatch and lack of polarization centers. Herein, we innovatively construct novel hollow structure FeCo@C (CMFC) with crystalline/amorphous heterojunction FeCo/C particles by cation exchange method, thereby achieving enhanced electromagnetic wave absorption. The CMFC achieves Ku-band effective absorption with a reflection loss of −50.57 dB and effective absorption bandwidth of 5.35 GHz at 1.8 mm. The CMFC exhibits excellent microwave absorption performance due to the presence of crystalline/amorphous FeCo/C heterojunction, which is attributed to the balanced dielectric loss and optimized impedance matching characteristics. CST simulations demonstrate that the CMFC has a radar scattering interface reduction value as high as 26.12 dBm (Wu et al., 2023) [2] at a scattering angle of 0°. This work provides new ideas for the rational design of hollow nanostructures with heterojunction particles for efficient microwave absorption.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
