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
摘要随着5G时代的到来，电磁污染也成为新的重要社会问题，受到了社会和科学界的广泛关注，因此开发具有高效微波吸收性能的材料具有非凡意义。本文采用简单的制备方法在石墨烯纳米片上均匀负载球形ZIF-67，并在高温退火后得到一种由二维（2D）和三维（3D）材料组成的新型电磁波吸收材料（石墨烯负载球型ZIF-67 衍生碳球，Co@C/GNs），中低频段的电导损耗、自然共振和交换共振，以及高频段的极化损耗和涡流损耗共同增强对电磁波的有效吸收。其中，石墨烯添加量为ZIF-67 质量的5% 时，吸波剂具有最佳吸波性能，在匹配厚度为2.5 mm 时，最小反射损耗值为−31.66 dB；在匹配厚度为1.5 mm 时，有效带宽可达5.56 GHz。这项工作为电磁吸收复合材料的制备提供了新的选择。
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.
