Thermal conversion of an Fe3O4@metal–organic framework: a new method for an efficient Fe–Co/nanoporous carbon microwave absorbing material
- Resource Type
- Authors
- Guangbin Ji; Cheng Yan; Bin Quan; Xiaohui Liang; Xingmiao Zhang; Wei Liu; Youwei Du; Chaomei Shang
- Source
- Nanoscale. 7:12932-12942
- Subject
- Materials science
Carbonization
Composite number
Reflection loss
Nanoparticle
chemistry.chemical_compound
Carbonyl iron
chemistry
Chemical engineering
Imidazolate
General Materials Science
Metal-organic framework
Composite material
Microwave
- Language
- ISSN
- 2040-3372
2040-3364
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.