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| Preparation and Electromagnetic Properties of ZIF-67 Derived Carbon Spheres Loaded on Graphene |
| LIU Zhenglin1，2， ZHA Borui2， WEI Bo2， ZHOU Jintang2， TAO Jiaqi2，
CHENG Zhenyu2， LIU Jun3， WU Fan1 |
| 1. Faculty of Science， Tianjin University， Tianjin 300072， China； 2. College of Materials Science and Technology，
Nanjing University of Aeronautics and Astronautics， Nanjing 211100， Jiangsu， China； 3. Yuxi Industries Group，
China North Industries Group， Nanyang 473000， Henan， China |
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Abstract With the arrival of the 5G era, electromagnetic pollution has also become a new public concern, which has
already received extensive attention from the social and scientific communities. Thus, it’s significant to develop materials
with efficient microwave absorption properties. In this paper, a simple preparation method was used to uniformly load
spherical ZIF-67 on graphene nanosheets, and a novel electromagnetic wave absorbing material consisting of twodimensional
(2D) and three-dimensional (3D) materials was achieved after high-temperature annealing (spherical ZIF-67
derived carbon spheres loaded on graphene, Co@C/GNs ). Conductivity loss, natural resonance and exchange resonance in
the low and middle-frequency bands, as well as polarization loss and eddy current loss in the high-frequency band, can
together enhance the effective absorption of electromagnetic waves. Among them, wave absorbers with 5% graphene by
mass of ZIF-67 have the best wave absorbing performance, with the minimum reflection loss value of − 31.66 dB at a
matching thickness of 2.5 mm and the effective bandwidth up to 5.56 GHz at a matching thickness of 1.5 mm. This work
provides an alternative option for the preparation of electromagnetic absorbing composites.
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Received: 17 June 2024
Published: 16 January 2025
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2024, Vol. 7 
