Composition Influence on the Properties of Titanium-Doped Gamma Iron Oxide Nanoparticles Prepared by Laser Pyrolysis Method

摘要

The aim of this work is the structural and sensing characterization of titanium-doped gamma iron oxide nanocomposites. These nanopowder materials were synthesized by the laser pyrolysis technique. It is based on the resonance between the emission of a CW CO_2 laser line and the infrared absorption band of a gas (vapour) precursor. Basically, sensitised iron pentacarbonyl and titanium tetrachloride-based mixtures were used as gas-phase reactants. The compositional characterization of the synthesized nanostructures was performed by means of different analytical techniques. Introducing Ti in the Fe_2O_3 network in small quantities (< 1 %) seems to have little influence on titanium doped powder morphology (mean grain size ～ 5nm) but increases the sensitivity of titanium doped iron oxide nanopowders with more then 20 % relatively to pure maghemite.