Nanotech 2007 Vol. 4
Nanotech 2007 Vol. 4
Technical Proceedings of the 2007 NSTI Nanotechnology Conference and Trade Show, Volume 4

Nanoparticles Chapter 2

Nanoscale Maghemite Iron Oxide Powders Prepared by Laser Pyrolysis

Authors: I. Morjan, F. Dumitrache, R. Alexandrescu, R. Birjega, I. Voicu, L. Gavrila, I. Soare, G. Filotti, V. Kuncser and V. Ciupina

Affilation: National Institute for Lasers, Plasma and Radiation Physics, Romania

Pages: 234 - 237

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


ISBN: 1-4200-6376-6
Pages: 768
Hardcopy: $139.95

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