title: Thermal conversion of an Fe₃O₄@metal-organic framework: a new method for an efficient Fe-Co/nanoporous carbon microwave absorbing material.
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.
authors.affiliation: College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, Peoples Republic of China. gbji@nuaa.edu.cn.
authors.forename: Xingmiao
authors.initials: X
authors.lastname: Zhang
authors.forename: Guangbin
authors.initials: G
authors.lastname: Ji
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Bin
authors.initials: B
authors.lastname: Quan
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Liang
authors.forename: Chaomei
authors.initials: C
authors.lastname: Shang
authors.forename: Yan
authors.initials: Y
authors.lastname: Cheng
authors.forename: Youwei
authors.initials: Y
authors.lastname: Du