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This work describes laser-assisted spray pyrolysis (LASP) technique developed to deposit nanoparticles coatings with controllable particles size. In this process, droplets of a precursor formed by atomizer are injected into a deposition chamber using SF6 as a carrier gas. The study were focused once on the effect of variation of the concentration of precursor solution on particle size of Al2O3 samples, and the other effect of variation of SF6 gas flow rate on the particle size of the samples. Decreasing of precursor concentration (0.25-0.1M) caused to decrease of the particle sizes with increase in density of Al2O3 nanoparticles. Decreasing of SF6 gas flow rate (4.5-2.5)L/min caused to decrease of the particle sizes with increase in density of Al2O3 nanoparticles and homogeneity of the samples.

Alumina --- Nanoparticles --- Laser-assisted spray pyrolysis --- Coatings