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Magnetic magnetite (Fe 3 O 4 ) nanoparticles have attracted a great deal of attention in both fundamental research and practical applications over the past decades. Down to the nanoscale, superparamagnetic Fe 3 O 4 nanoparticles with only a single magnetic domain exhibit high magnetic susceptibility, which provides a stronger and faster magnetic response. Their superparamagnetic properties together with other intrinsic properties such as low toxicity, high surface area-to-volume ratio and simple separation methodology, making them ideal for environmental remediation, biomedical, and agricultural applications. This review discusses three conventional wet chemical methods, including chemical co-precipitation, sol-gel synthesis and thermal decomposition for the preparation of superparamagnetic Fe 3 O 4 nanoparticles with controlled size and magnetic properties. Nowadays, with the growing research interest in Fe 3 O 4 nanoparticles, there is a great amount of researches reported on efficient routes to prepare size-controlled magnetic nanoparticles. Thus, this review is designed to report the recent information from synthesis to the characterization of Fe 3 O 4 nanoparticles as well as the discussion of future perspective in this research area.

Preparation and characterization of superparamagnetic magnetite (Fe3O4) nanoparticles: A short review