Magnesium Ferrite (MgFe2O4) Nanostructures Fabricated by Electrospinning

Khon Kaen University Department of Physics, Faculty of Science, Small & Strong Materials Group (SSMG) Khon Kaen 40002 Thailand
Nanoscale Research Letters (Impact Factor: 2.78). 03/2008; 4(3):221-228. DOI: 10.1007/s11671-008-9229-y
Source: PubMed


Magnesium ferrite (MgFe(2)O(4)) nanostructures were successfully fabricated by electrospinning method. X-ray diffraction, FT-IR, scanning electron microscopy, and transmission electron microscopy revealed that calcination of the as-spun MgFe(2)O(4)/poly(vinyl pyrrolidone) (PVP) composite nanofibers at 500-800 degrees C in air for 2 h resulted in well-developed spinel MgFe(2)O(4) nanostuctures. The crystal structure and morphology of the nanofibers were influenced by the calcination temperature. Crystallite size of the nanoparticles contained in nanofibers increased from 15 +/- 4 to 24 +/- 3 nm when calcination temperature was increased from 500 to 800 degrees C. Room temperature magnetization results showed a ferromagnetic behavior of the calcined MgFe(2)O(4)/PVP composite nanofibers, having their specific saturation magnetization (M(s)) values of 17.0, 20.7, 25.7, and 31.1 emu/g at 10 Oe for the samples calcined at 500, 600, 700, and 800 degrees C, respectively. It is found that the increase in the tendency of M(s) is consistent with the enhancement of crystallinity, and the values of M(s) for the MgFe(2)O(4) samples were observed to increase with increasing crystallite size.

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    • "This may be due to the stretching vibrations between the oxygen atoms and the metal cations (Fe-O) [23] [37] [39]. Based on the above results, we can deduce that PVP have totally decomposed. "
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    ABSTRACT: In this study, we successfully synthesized magnesium ferrite (MgFe2O4) nanofibers by a facile electrospinning technique followed by calcining at 800 °C. The lithium storage properties of MgFe2O4 nanofibers as anode materials for lithium-ion batteries have been discussed for the first time. It is demonstrated that MgFe2O4 nanofibers electrode not only deliver a high initial discharge capacity of around 1304 mAh g−1, but also maintain a reversible capacity of 714 mAh g−1 after 100 cycles. Moreover, the MgFe2O4 nanofibers electrode also exhibits high capacity at higher charge/discharge rate. Even at a current density of 2000 mA g−1, the reversible capacity can attain 409 mAh g−1 after 100 cycles, suggesting its excellent rate capability. The superior lithium storage properties of the MgFe2O4 nanofibers electrode may be related to the unique continuous fibrous morphologies, nanostructured architectures, porous structures, and large specific surface area, which provide an easily Li+ diffusion path and promote electron transfer. In addition, the formation of MgO appears to act as a buffer layer that prevents agglomeration of nanocrystalline, accommodate the large volume change and reduces polarization during cycling.
    Electrochimica Acta 02/2015; 160. DOI:10.1016/j.electacta.2015.02.012 · 4.50 Impact Factor
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    • "The increase in calcination temperature leads to the increase in the size of crystal. Recently, they are used in compact and lightweight and high efficiency switching power supplies.[13] [14]. "
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    ABSTRACT: Nanocrystalline form of manganese ferrite (MnFe2O4) has been synthesized by simple sol-gel auto combustion method using citric acid as chelating agent. The obtained nanocrystalline powders of manganese ferrite were subjected to structural and magnetic measurements. Temperature dependent magnetization was also carried out for the single phase nanocrystalline manganese ferrite and the results have been discussed in detail. © 2014 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.
    Physics Procedia 12/2014; 54. DOI:10.1016/j.phpro.2014.10.053
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    ABSTRACT: This paper describes the fabrication of cobalt ferrite (CoFe2O4) nanostructures (in the form of nanofibers and nanoparticles) by the electrospinning method using a solution that contained poly(vinyl pyrrolidone) (PVP) and cheap Co and Fe nitrates as metal sources. The as-spun and calcined CoFe2O4/PVP composite samples were characterized by TG-DTA, X-ray diffraction, FT-IR, SEM and TEM, respectively. After calcination of the as-spun CoFe2O4/PVP composite nanofibers (fiber size of 320±48 nm in diameter) at 500, 600, and 800°C in air for 3 h with different heating rates of 5 or 20°C/min, either NiFe2O4 nanofibers of ∼10−200 nm in diameter or nanoparticles with particle sizes of ∼50−400 nm having a well-developed spinel structure were successfully obtained. The crystal structure and morphology of the nanofibers were influenced by the calcination temperature and heating rate. A faster heating rate allowed for a rapid removal of the PVP matrix and resulted in a complete change from fibrous structure to particle in the calcined CoFe2O4/PVP composite nanofibers. Room temperature magnetization results showed a ferromagnetic behavior of the calcined CoFe2O4/PVP composite nanofibers, having their hysteresis loops in the field range of ± 4500 and 3000 Oe for the samples calcined respectively with heating rates of 5 and 20°C/min. The values of the specific magnetization (M s) at 10 kOe, remnant magnetization (M r), M r/M s ratio, and coercive forces (H c) are obtained from hysteresis loops. It was found that the values of M s, M r, M r/M s, and H c depended strongly on morphology of the CoFe2O4 nanostructures.
    Applied Physics A 10/2009; 97(1):167-177. DOI:10.1007/s00339-009-5256-5 · 1.70 Impact Factor
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