P312
Fabrication of Cobalt (II,III) Oxide Nanoparticles by Pulsed Laser Ablation
Quan Li, Takeshi Sasaki, Naoto Koshizaki
NIMC
Nanosized cobalt (II,III) oxide particles with mean diameters of 1.5-3.5 nm
and narrow size distribution were successfully prepared by laser ablation
technique in He and Ar atmospheres. The effects of process parameters, i.
e. ambient pressure, fluence, pulse number and repetition rate on the mean
diameters of Co3O4 nanoparticles were extensively investigated. Mean
diameters of the deposited nanoparticles did mot show significant variation
with the repetition rate and fluence while they increased with the pulse
number. With the increase of ambient pressure, mean diameters of the
primary nanoparticles increased initially and reached the maximum of 3.3
and 2.7 nm in Ar and He atmospheres, respectively. The further increase of
the ambient pressure resulted in the decrease of the diameter.
Nanoparticles deposited in Ar were generally larger in mean diameter than
those prepared in He atmosphere even the process parameters are the same.
Relevant dynamic model was proposed to interpret the experimental results.
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