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A Facile Chemical Synthesis of Silica Coated FeCo Nanocubes
Komkrich Chokprasombat,Santi Maensiri 한국자기학회 2020 Journal of Magnetics Vol.25 No.2
FeCo nanostructures are of interest because of their high magnetization and low coercivity which are suitable for biomedical applications. However, particle morphologies are still difficult to control. In this work, the FeCo nanocubes have been prepared by a chemical reduction method using hydrazine as a reducing agent. Using only polyvinylpyrrolidone (PVP) as a capping agent without cyclohexane as previous works, the obtained particles are quite uniform in shape and air-stable, and can be facile coated with silica. Nevertheless, to obtain the uniform FeCo nanocubes, the concentration of sodium hydroxide used in the synthesis needs to be optimized. The obtained FeCo nanocubes exhibit a high saturation magnetization of 220.9 emu/g and low coercivities of around 180 Oe.
Sumalin Phokha,Ekaphan Swatsitang,Santi Maensiri 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.6
This study reports the structural and magnetic properties of CeO2 nanoparticles synthesized using a simple thermal decomposition method. The samples show room-temperature ferromagnetism (RT-FM) when thermally decomposed at above 500°C. Ferromagnetic ordering occurs due to the presence of Ce3+ as confirmed by transmission electron microscopy (TEM) and x-ray absorption near edge spectroscopy (XANES). High resolution TEM results also reveal the Ce2O3 (Ce3+) phase can be attributed to the formation of defects/oxygen vacancies at its surface. The F-center exchange interaction has been proposed as playing an important role in the magnetic behavior of the prepared CeO2 nanoparticles.