@article{Wu2023, 
author = {Dan Wu and Yiqun Wang and Shuanglin Deng and Di Lan and Zhongning Xiang and Qinchuan He},
title = {Heterostructured CoFe@N-doped carbon porous polyhedron for efficient microwave absorption},
year = {2023},
journal = {Nano Research},
volume = {16},
number = {2},
pages = {1859-1868},
keywords = {microwave absorption, heterojunction, metal-organic framework (MOF), Fe2+ replacement, ultrabroad bandwidth},
url = {https://www.sciopen.com/article/10.1007/s12274-022-5341-z},
doi = {10.1007/s12274-022-5341-z},
abstract = {The synthesis of wide bandwidth, thin thickness, and high performance microwave absorbing materials has become a hot topic of current research. Metal-organic frameworks with heterojunctions and porous structures are considered as suitable candidates to meet these characteristics. Herein, heterogeneous CoFe@N-doped porous carbon polyhedron composites were successfully synthesized via Fe2+ to replace Co in zeolite imidazole frame-67. The dielectric properties of composites were enhanced by the replacement of Fe2+, and the synergistic effect of dielectric loss and magnetic loss was realized. The petal-like lamellar structure increases the travel of electromagnetic (EM) waves, and the formation of porous structures improves impedance matching. Specifically, a reflection loss of −67.30 dB was obtained at a thickness of 2.88 mm, and an ultrabroad wide effective absorption bandwidth of 8.40 GHz was obtained, covering most of the X-band (8–12 GHz) and the whole Ku-band (12–18 GHz). The radar cross section (RCS) reduction value can reach 29.4 dB·m2, which means that the radar detector has a smaller probability of detecting targets. This work describes the unique advantages of metal ion replacement metal-organic frameworks derived materials in structural design, impedance matching, and performance adjustment, and provides a new reference for the field of electromagnetic wave absorption.}
}