L301
Preparation of transition metal oxide nanoparticles by laser ablation technique
Naoto Koshizaki,
Takeshi Sasaki,
Quan Li
NIMC
We have prepared trannstion metal oxide nanoparticles such as Fe2O3, Co3O4, ZnO and TiO2
by ArF excimer laser ablation technique. The most important parameter to control the
nanoparticle size was gas atmosphere and pressure. Transmission electron microscopy images
showed that the average sizes of the obtained nanoparticles were in the range of 1.5 to
3.5 nm with narrow size distributions under Ar atmosphere. With the increase of the ambient
pressure, the average particle size increased and showed a maximum at the pressure of 100 Pa.
Further increase of the ambient Ar pressure resulted in the decrease of the primary particle
size, while the agrregated nanoparticles were observed. The nanoparticle size can be reduced
by using He atmosphere instead of Ar. Detailed discussions on the particle formation process
and the application of this technique will be presented.
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