Magnetic Dodecahedral CoC-Decorated Reduced Graphene Oxide as Excellent Electromagnetic Wave Absorber
A two-step method has been adopted to synthesize cobalt nanoclusters in carbon (CoC)-decorated reduced graphene oxide (rGO) from graphene oxide (GO) and ZIF-67 as an excellent stable electromagnetic wave (EMW) absorber. Firstly, the electrostatic force between GO and Co2+ gave rise to in situ growth of ZIF-67 on GO (ZIF-67–GO). Then CoC–rGO was obtained by calcination of ZIF-67–GO hybrids. The ligand is introduced as the nitrogen source to GO. The crystal structure, chemical composition, and magnetic properties of CoC–rGO were investigated by x-ray powder diffraction analysis, Fourier-transform infrared (FT-IR) spectroscopy, Raman spectroscopy, x-ray photoelectron spectroscopy, and vibrating-sample magnetometry. The morphology was observed by scanning electron microscopy and transmission electron microscopy. By adjusting the ratio of GO to ZIF-67, the electromagnetic parameters of CoC–rGO can be optimized. It was found that the sample consisting of 10 wt.% CoC–rGO-2 in a paraffin matrix exhibited excellent EMW absorption performance, reaching a minimum reflection loss (RLmin) of −44.77 dB with thickness of 2.1 mm and an effective bandwidth (RL ≤ −10 dB) of up to 5.2 GHz at thickness of 1.8 mm. The results of this study open an effective and simple avenue for the design of EMW absorbers using metal–organic framework (MOF) and low-cost carbon materials.
KeywordsElectrostatic force CoC–rGO hybrids EMW absorption
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This work was supported by the National Defense key program Fundamental Research Program (No. A35201XXXXX), National Natural Science Foundation of China (No. 51303106), Fundamental Research Funds for the Central Universities (DUT18GF107), Xingliao Elite Program Project (Special Professor of Liaoning Province-2018), Aviation Science Foundation (No. 20173754009), and LiaoNing Revitalization Talents Program (Nos. 1802085 and 1807003).
Conflict of Interest
The authors declare that they have no conflicts of interest.
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