Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 31, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202204370
Keywords
carbon nanocages; metal-organic frameworks; microwave absorption; subnanometer clusters; synergistic polarization
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Funding
- National Key Research and Development Program of China [2019YFE0121700]
- National Key Scientific Instrument and Equipment Development Project of China [51927802]
- Fundamental Research Funds for the Provincial Universities of Zhejiang [GK219909299001-003]
- Zhejiang Provincial Key Research and Development Program [2019C01121]
- National Natural Science Foundation of China [U1908220]
- Natural Science Foundation of Liaoning province [2021-MS-092]
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This study demonstrates the enhanced dielectric loss capacity through dielectric polarization in sub-nanometer hetero-substitutions, providing insights for the design of high-performance electromagnetic absorption materials.
Compositing dielectric and magnetic components have been proven effective in optimizing electromagnetic (EM) wave absorption, in which the dielectric loss capacity can be reinforced by the polarization effects of hetero-substitutions. Here, the dielectric polarization through the energy transformation between the relatively complex permeability and permittivity in nitrogen-doped carbon nanocages (NCNs) with sub-nanometer Fe clusters is further boosted. As a transition state between single Fe atoms and Fe3O4 nanoparticles hetero-substitutions, these subnanometer Fe clusters confined in NCNs can be achieved by carbonizing FePc@ZIF-8 composites at 900 degrees C. Benefitting from their unique structures, an enhanced dielectric loss tangent of 1.57 is obtained at 10 GHz, which is 3.0 and 1.6 times higher than those of single Fe atoms and Fe3O4 nanoparticles hetero-substitutions, respectively. Furthermore, the minimum reflection loss can reach -64.75 dB at 7.1 GHz (2.7 mm) and the effective absorption bandwidth is 6.2 GHz (11.8-18 GHz, covering the full P-band) at 1.7 mm. The present study provides intrinsic insight into the dielectric polarization behaviors in subnanometer hetero-substitutions, inspiring the design of high-performance EM absorption materials.
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