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Synthesis Of Magnetite Nanoparticles Via A Solvent-free Thermal Decomposition Route

D. Maity, Shi-Guang Choo, J. Yi, J. Ding, J. Xue
Published 2009 · Physics

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Abstract Superparamagnetic nanoparticles have been widely applied in various bio-medical applications. To date, it is still a challenge to synthesize nanosized Fe 3 O 4 particles with controlled size and distribution. In this paper, a novel solvent-free thermal decomposition method is reported for synthesizing Fe 3 O 4 nanoparticles. Size and morphology of the nanoparticles are determined by TEM while the structure of the nanoparticles is identified by FTIR, XPS and TGA measurements. Magnetic properties of the obtained particles are determined using VSM and SQUID measurement. The particle size of the Fe 3 O 4 can be tailored by adjusting either reaction temperature or time. When the reaction temperature is increased to 330 °C and the reaction time is extended to 4 h, the average particle size of the obtained nanoparticles is ∼9 nm, while M s value reaches ∼76 emu/g. The as synthesized Fe 3 O 4 nanoparticles show well-established superparamagnetic properties with the blocking temperature at around 100 K.
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