Abstract
The high performance “thin, light, wide and strong” pursued by microwave absorbing materials is strongly determined by the structure regulation of materials. Herein, we developed the metal/covalent organic frameworks (MOFs/COFs) heterostructures for enabling multiple interfaces and abundant defect vacancies to enhance impedance matching characteristic and dissipation property. The MOF presents uniform pore distribution, large specific surface area and tunable chemical structures. Furthermore, two kinds of COFs were formed by successively polymerizing based on Schiff-base reaction, and in-situ coated on the MOFs-derived Co/C hybrids to favor rich interfaces. The Co/C@TpPa possesses a minimum reflection loss (RLmin) of −48.7 dB at ultrathin thickness of 1.61 mm. In particular, the RLmin of Co/C@TAPB-PDA is −50.6 dB at 8.8 GHz. Meanwhile, CST simulation was carried out to confirm the microwave absorption capabilities under actual far field conditions. The Radar cross section (RCS) values for Co/C@TpPa and Co/C@TAPB-PDA at 0° scattering angle are reduced to 3.88 dB m2 and -12.23 dB m2 from 7.96 dB m2 (Co/C). It is noted that the RCS values of MOFs/COFs-derived hybrids are less than −10 dB m2 at −90°∼90°. This novel MOFs/COFs open up an avenue for advanced absorbing materials.
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.
