Abstract
Nitrogen-doped reduced graphene oxide/cobalt lanthanum ferrite (NRGO/CoLaxFe2−xO4) composites were synthesized by using a facile hydrothermal process. The results of X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) mapping indicate that the Fe3+ ions were substituted with La3+ ions in the lattice, without altering the crystal structure. X-ray photoelectron spectroscopy (XPS) result exhibits that N atoms are combined with C atoms in the reduced graphene oxide (RGO), in the form of various bonds. Hence, the composites have excellent microwave absorption performance. An optimal reflection loss of − 58.46 dB is observed at 4.88 GHz, as the composition is NRGO/CoLa0.2Fe1.8O4. Moreover, the sample NRGO/CoLa0.3Fe1.7O4 has a wide effective absorption bandwidth of 3.8 GHz, partially covering the X and Ku bands. The enhanced dipole polarization associated with the La3+ doping, the multiple interface polarization related to NRGO and CoLaxFe2−xO4, and the magnetic loss of CoLaxFe2−xO4are responsible for the enhanced microwave absorption performance of the composites. It is believed that the composites have prospect of becoming high-efficiency microwave absorber.
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Acknowledgements
This work was supported by Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (Grant No. 2021-K19), the Key Technologies R&D Program of Anhui Province of China (Grant No. 202104a05020033), the Opening Project of State Key Laboratory of High Performance Ceramics and Superfine Microstructure (Grant No. SKL202003SIC), Anhui International Joint Research Center for Nano Carbon-based Materials and Environmental Health (Grant No. 2020R0109), the Key Projects of Natural Science Foundation of Colleges and Universities of Anhui Province (Grant No. KJ2019A0117), the Shenzhen Technology University (SZTU) for the financial support of Start-up Grant (2018), and Natural Science Foundation of Top Talent of SZTU (Grant No. 2019010801002).
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Yin Liu designed the experiment. Mingli Wang and Jun Zhou conducted the experiments. Mingli Wang, Jun Zhou, Xiangfeng Shu,Hengdong Ren, Yin Liu, and Jialin Ma contributed to sample characterization. Mingli Wang, Jun Zhou, Yin Liu, and Xiangfeng Shu analyzed the experimental data. Mingli Wang finished the manuscript with the support of Yin Liu, YueqinWang,Ling Bing Kong, Won-Chun Oh, and Hongcun Bai. All authors participated in the discussion of the results.
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Wang, M., Zhou, J., Shu, X. et al. Nitrogen-doped graphene oxide and lanthanum-doped cobalt ferrite composites as high-performance microwave absorber. J Mater Sci: Mater Electron 32, 21685–21696 (2021). https://doi.org/10.1007/s10854-021-06687-8
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DOI: https://doi.org/10.1007/s10854-021-06687-8