Speaker
Description
Energy harvesting technologies have attracted considerable attention today. Various nano or microgenerators based on piezoelectric, triboelectric, and electromagnetic effects are becoming popular to design and realize many self-powered applications (1). Electromagnetic generators (EMG) offer numerous advantages, including possible architectures and nanostructured materials for device fabrication.
In this work, the synthesis of hollow CoFe2O4 microspheres was carried out using carbon microspheres as sacrificial structures. The synthesis was carried out in three steps. The first step is the hydrothermal synthesis of carbon microspheres from anhydrous dextrose, and the second step is the incorporation of the precursor salts of cobalt ferrite (2Fe(NO3)3·9H2O + Co(NO3)2·6H2O) in the presence of the carbon microspheres subjected to a solvothermal method for 15 hours with a controlled temperature of 150 ◦C, finally, the hollow microsphere is obtained from the calcination of the sacrificial structure in a muffle with a heating ramp of 1 °C/min until reaching 500 °C. The temperature is maintained for 4 h. The morphological characterization of the microsphere was done by scanning electron microscopy (SEM), observing spheres with average diameters of 4 µm, consistent with the sizes of the sacrificial structures. Regarding the magnetic nature of the cobalt ferrite microspheres, a remanent magnetization of 2.85x10-3 emu and a coercivity of 32.5 Oe were achieved, typical values of a ferromagnetic material.
Reference
(1) Oh, Y., Sahu, M., Hajra, S. et al. Spinel Ferrites (CoFe2O4): Synthesis, Magnetic Properties, and Electromagnetic Generator for Vibration Energy Harvesting. J. Electron. Mater. 51, 1933–1939 (2022). https://doi.org/10.1007/s11664-022-09551-5
This work was supported by
Proyecto: CBF 2023-2024-4069, CONAHCYT Ciencia Básica y de Frontera 2023-2024
| Keywords | Co Fe2 O4, energy harvesting, hollow microspheres, synthesis, characterization |
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