2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Nanoscale Maghemite Iron Oxide Powders Prepared by Laser Pyrolysis

I. Morjan, F. Dumitrache, R. Alexandrescu, R. Birjega, I. Voicu, L. Gavrila, I. Soare, G. Filotti, V. Kuncser and V. Ciupina
National Institute for Lasers, Plasma and Radiation Physics, RO

Keywords:
nanoparticles, laser pyrolysis, maghemite, magnetite, iron oxide

Abstract:
Nano-sized maghemite particles (usually less than 15 nm diameter) have been directly synthesized by the laser induced pyrolysis of iron pentacarbonyl vapors. Ethylene was used as sensitizer of the induced reaction. By the controlled use of air as oxidizer, iron oxide nanoparticles in the gamma phase were obtained. The variation of the laser power resulted in nanopowders with different particle sizes and crystallinity. The particles were characterized by X-ray diffraction, transmission electron microscopy and Mössbauer spectroscopy. A general feature of the synthesized iron-based nanoparticles was their narrow size distributions. Magnetic properties of these materials showed a strong dependence on the particle size and on the degree of crystallinity

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