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Room temperature synthesis of single-crystal Fe 3 O 4 nanoparticles with superparamagnetic property



Single-crystal Fe 3 O 4 nanoparticles with uniform size and relatively better monodispersity have been successfully synthesized via a facile room temperature coprecipitation route in the present of poly(vinyl pyrrolidone) (PVP). This method does not require high temperature, expensive and toxic starting materials, complicated procedure and toxic organic solvents. The magnetic properties of as-prepared samples were recorded on a superconducting quantum interference device magnetometer. Its blocking temperature is 140 K. The hysteresis loops of single-crystal Fe 3 O 4 nanoparticles at 300 K and 10 K show the transition from superparamagnetic to ferromagnetic behavior. And the maintenance of high saturation magnetization ascribes to the single-crystalline nature of these Fe 3 O 4 nanoparticles.



Applied Physics A: Materials Science ProcessingSpringer Journals

Published: Feb 1, 2007

DOI: 10.1007/s00339-006-3766-y

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