Nanoscale Maghemite Iron Oxide Powders Prepared by Laser Pyrolysis

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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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Journal: TechConnect Briefs
Volume: 4, Technical Proceedings of the 2007 NSTI Nanotechnology Conference and Trade Show, Volume 4
Published: May 20, 2007
Pages: 234 - 237
Industry sector: Advanced Materials & Manufacturing
Topics: Nanoparticle Synthesis & Applications
ISBN: 1-4200-6376-6