Journal
CERAMICS INTERNATIONAL
Volume 47, Issue 1, Pages 643-653Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2020.08.172
Keywords
Porous structure; Multiple loss mechanisms; Electromagnetic wave absorption; Impedance matching
Categories
Funding
- National Pre-research Foundation of China [6140208010201, 61402080104, JXXX-2019-058]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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A rod-like porous Co/C composite with excellent microwave absorption performance was successfully fabricated in this study and showed significant potential for application in the field of EM wave absorption. The synergy between the porous carbon framework and cobalt nanoparticles, as well as the multiple polarization loss due to the porous nature of the structure, contributed to the favorable microwave absorption performance of the Co/C composites.
A rod-like porous Co/C composite was successfully fabricated by carbonizing a Co-based MOF-74 precursor. Due to significant synergy between the porous carbon framework (dielectric loss) and cobalt nanoparticles (magnetic loss) coupled with the multiple polarization loss (interfacial or dipole polarization loss) due to the porous nature of the structure, the Co/C composites showed extremely favorable microwave absorption performance. When the as-prepared cobalt-based MOF precursor was annealed at 700 degrees C (S700), the supreme EM wave reflection per-formance was -38.46 dB at 7.82 GHz with a coating thickness of 2.5 mm, whereas the broadest effective absorption bandwidth (3.3 GHz) was obtained with a coating thickness of 1.5 mm. Moreover, S600 samples exhibited an expansive absorption bandwidth range of 14.82 GHz (3.18-18 GHz) as the coating thickness was varied from 1.0 mm to 5.5 mm. The unique rod-like porous Co/C samples prepared in this study have significant potential for application in the field of the EM wave absorption.
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