Abstract
Development of high-performance microwave absorption materials with a thin matching thickness, wide effective absorption bandwidth, low filler loading, and strong absorption capacity has attracted extensive scientific and technological interest and it remains a huge challenge. Here, hierarchical accordion-like Ni@porous carbon (Ni@C) nanocomposites derived from metal-organic frameworks were rationally designed and successfully developed as enhanced microwave absorption materials. It was found that the well-tuned composition (Ni, C and CNTs) and structure (laminated, porous, and core-shell characteristics) of the resultant nanocomposites led to the variation of magnetic properties, graphitization degree, and electromagnetic parameters. As expected, the hierarchical accordion-like Ni@C nanocomposites with a low filler loading of 25 wt% achieved a broad effective absorption bandwidth of 6.6 GHz, a strong reflection loss of −86.9 dB with a thin thickness of 1.8 mm through the optimization of impedance matching and improvement of microwave attenuation ability. The enhanced microwave absorption was attributed to the loss synergistic effect between abundant interfacial and dipole polarization in the hierarchical architecture, to the electronic transport in the three-dimensional conductive network, and to strong magnetic coupling in Ni nanoparticles. Therefore, this work presented a tailored strategy for the development of novel hierarchical nanocomposites as enhanced microwave absorption materials.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.