Journal
NANOSCALE
Volume 7, Issue 30, Pages 12932-12942Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5nr03176a
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Funding
- Aeronautics Science Foundation of China [2014ZF52072]
- National Natural Science Foundation of China [51172109, 11475086]
- Fundamental Research Funds for the Central University [3082014NS2014057]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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A novel FeCo nanoparticle embedded nanoporous carbon composite (Fe-Co/NPC) was synthesized via in situ carbonization of dehydro-ascorbic acid (DHAA) coated Fe3O4 nanoparticles encapsulated in a metal-organic framework (zeolitic imidazolate framework-67, ZIF-67). The molar ratio of Fe/Co significantly depends on the encapsulated content of Fe3O4 in ZIF-67. The composites filled with 50 wt% of the Fe-Co/NPC-2.0 samples in paraffin show a maximum reflection loss (RL) of -21.7 dB at a thickness of 1.2 mm; in addition, a broad absorption bandwidth for RL < -10 dB which covers from 12.2 to 18 GHz can be obtained, and its minimum reflection loss and bandwidth (RL values exceeding -10 dB) are far greater than those of commercial carbonyl iron powder under a very low thickness (1-1.5 mm). This study not only provides a good reference for future preparation of carbon-based lightweight microwave absorbing materials but also broadens the application of such kinds of metal-organic frameworks.
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