Document Type : Original Article
Authors
1
Electron Microscope and Thin Films Dept., Physics Research Division, National Research Centre, 33 El-Buhouth St., P.O. 12622, Dokki, Cairo, Egypt.
2
Electron Microscope and Thin Films Dept., Physics Research Division, National Research Centre, 33 El-Buhouth St., P.O. 12622, Dokki, Cairo, Egypt
3
Electron Microscope and Thin films Dept., Physics Research Division, National Research Centre, El-Bohoos str., 12622, Dokki, Giza, Egypt
4
Microwave Physics and Dielectrics Dept., Physics Division, National Research Center, Cairo, Egypt.
Abstract
Electrical energy storage is very crucial and is required in our life for every portable electronic device. Ferrite nanoparticles (NiFe2O4, Co0.5Ni0.5Fe2O4 and CoFe2O4) were prepared by simple co-precipitation process, and their nano-composites based on polyaniline (CoFe2O4/PANI, Co0.5Ni0.5Fe2O4/ PANI and NiFe2O4/PAN) assigned as (S1, S2, and S3) respectively were synthesized by the in-situ chemical oxidative polymerization method. The structure of the produced samples was analyzed by X-ray diffraction (XRD), A cubic phase structure of CoFe2O4 in addition to a tetragonal phase of Fe2O3 nanoparticles were identified and they embedded in a semi-crystalline PANI matrix with a higher degree of crystallinity. The crystallite size of 6.98, 5.74, and 6.14 nm were calculated for S1, S2, and S3 respectively. The field emission scanning electron microscope (FESEM) with energy dispersive x-ray mapping analysis was used to analyze the surface morphology. The optical energy gap of the prepared nano-composites was studied by the UV-vis technique. The calculated energy gaps 1.08, 1.0, and 1.04 eV for S1, S2, and S3 respectively were found to slightly change with composition. Magnetic hysteresis loop of nanocomposites were recorded at room temperature using a vibrating sample magnetometer (VSM). The magnetic parameters; saturation magnetization Ms, remanenet magnetization Mr, and corecivity have been measure. The highest saturation magnetization (Ms), coerecivity (Hc) and squreness were registered for CoFe2O4/PANI nano-composite ( 13.686 emu/gram, 55.759 Oe and 29.333*10-3 respectively.) due to the magnetic anisotropy of cobalt. The dielectric properties permittivity, dielectric loss, and AC conductivity were evaluated in the frequency range from 10-1 Hz to 107 Hz using a Novo control Alpha analyzer. The Ni0.5Co0.5Fe2O4/PANI nano-composite sample introduces excellent prospective permittivity, which in turn leads to a significant improvement in capacitance. On the other hand, it showed the highest conductivity. So, the Ni0.5Co0.5Fe2O4/PANI nano-composite offers great prospects for electrical energy storage applications as well as a promising active electrode material for energy storage appliances and electromagnetic wave filters.
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