Enhanced microwave absorption performance of MOF-derived hollow Zn-Co/C anchored on reduced graphene oxide
Yue Wang(王玥), Dawei He(何大伟)†, and Yongsheng Wang(王永生)
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, China
Abstract Composite materials assembled by metal/carbon nanoparticles and 2D layered flakes can provide abundant interfaces, which are beneficial for high-performance microwave absorbers. Herein, Zn-Co/C/RGO composites, composed of Zn-Co metal-organic framework-derived Zn-Co/C nanoparticles and reduced graphene oxide (RGO), were obtained through a facile method. The multilayer structure was due to the introduction of hollow Zn-Co/C nanoparticles in the RGO sheets. Zn-Co/C nanoparticles provided abundant polarization and dipole centers on the RGO surface, which enhanced the microwave absorption abilities. Different concentrations of RGO were introduced to optimize impedance matching. The minimum reflection loss (RL) of Zn-Co/C/RGO with a thickness of 1.5 mm reached -32.56 dB with the bandwidth corresponding to RL at -10 dB, which can reach 3.92 GHz, while a minimum RL of -47.15 dB at 11.2 GHz was also obtained at a thickness of 2.0 mm. The electromagnetic data demonstrate that Zn-Co/C/RGO presented excellent absorption performance and has potential for application in the microwave absorption field.
Received: 08 December 2020
Revised: 23 December 2020
Accepted manuscript online: 30 December 2020
PACS:
78.30.Jw
(Organic compounds, polymers)
Fund: Project supported by the National Key R&D Program of China (Grant No. 2016YFA0202302), the National Natural Science Foundation of China (Grant Nos. 61527817, 61875236, 61905010, and 61975007), and Beijing Natural Science Foundation, China (Grant No. Z190006).
Corresponding Authors:
Dawei He
E-mail: dwhe@bjtu.edu.cn
Cite this article:
Yue Wang(王玥), Dawei He(何大伟), and Yongsheng Wang(王永生) Enhanced microwave absorption performance of MOF-derived hollow Zn-Co/C anchored on reduced graphene oxide 2021 Chin. Phys. B 30 067804
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