Abstract
In this work, the CoFe2O4/graphite-polypyrrole (PPy) metacomposites with negative dielectric constant were prepared by the surface-initiated-polymerization method. The dielectric constant of CoFe2O4/graphite composites is positive, while the dielectric constant of CoFe2O4/graphite-PPy composites is negative. The regulation of the negative dielectric constant of CoFe2O4/graphite-PPy metacomposites was accomplished by changing the content of CoFe2O4/graphite. The negative dielectric constant of 10.0 wt% CoFe2O4/graphite-PPy metacomposites reaches −1.82 × 103 in the measured frequency range. The crystal structure, chemical structure, and microstructure of all the samples were analyzed by the XRD, FT-IR, Raman, and SEM systematically. All the characterizations indicate that the CoFe2O4/graphite-PPy metacomposites were successfully fabricated. Meanwhile, the magnetic properties of the samples were reported in this work. The remanence, coercivity, and saturation magnetization is 10.50 emu g−1, 0.314 T, and 25.34 emu g−1 for CoFe2O4/graphite-PPy metacomposites with a CoFe2O4/graphite loading of 40.0 wt%. This work provides the guideline for fabrication of polymer-based metacomposites with tunable negative dielectric constant.
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Funding
The work is supported by the Research Starting Foundation of Shaanxi University of Science and Technology (grant no. 2019QNBJ-01), the Research Foundation for Thousand Young Talent Plan of Shaanxi province of China, the National Natural Science Foundation of China (grant no. 51972200), the National Natural Science Foundation of China (grant no. 51902192), the Natural Science Basic Research Program of Shaanxi (program no. 2022JQ-441), the Taif University Researchers Supporting Project number (TURSP-2020/267), Taif University, Taif, Saudi Arabia.
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Guo, J., Chen, Z., El-Bahy, Z.M. et al. Tunable negative dielectric properties of magnetic CoFe2O4/graphite-polypyrrole metacomposites. Adv Compos Hybrid Mater 5, 899–906 (2022). https://doi.org/10.1007/s42114-022-00485-4
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DOI: https://doi.org/10.1007/s42114-022-00485-4