A facile synthesis method for monodisperse Fe nanoparticles has been developed by the injection of iron carbonyl into kerosene in one pot. By controlling reaction parameters, 3-12 nm Fe nanoparticles were prepared. The size distribution is very narrow and any size-selective treatment is not required, even when several grams of Fe nanoparticles are synthesized. Magnetic measurements reveal that the saturation magnetization (Ms) of the 9.3 nm Fe nanoparticles is always over 150 emu g-1 at room temperature.
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