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Issue 30, 2015
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Thermal conversion of an Fe3O4@metal–organic framework: a new method for an efficient Fe–Co/nanoporous carbon microwave absorbing material

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Abstract

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.

Graphical abstract: Thermal conversion of an Fe3O4@metal–organic framework: a new method for an efficient Fe–Co/nanoporous carbon microwave absorbing material

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Publication details

The article was received on 14 May 2015, accepted on 23 Jun 2015 and first published on 25 Jun 2015


Article type: Paper
DOI: 10.1039/C5NR03176A
Nanoscale, 2015,7, 12932-12942

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    Thermal conversion of an Fe3O4@metal–organic framework: a new method for an efficient Fe–Co/nanoporous carbon microwave absorbing material

    X. Zhang, G. Ji, W. Liu, B. Quan, X. Liang, C. Shang, Y. Cheng and Y. Du, Nanoscale, 2015, 7, 12932
    DOI: 10.1039/C5NR03176A

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