Resumo

VITTA BRITO, Yosmery et al. Comparative study of production of iron nanoparticles by laser ablation in solution and inert gas. Rev. Fac. Ing. UCV [online]. 2014, vol.29, n.4, pp.17-24. ISSN 0798-4065.

In this work, we present a methodology of production for iron nanoparticles (iron Np) in organic solvents, by laser ablation. Using an inert gas stream the particles are blowing into solvent (LAiGS). The nanoparticles produced by this method were compared with nanoparticles produced by direct laser ablation in metal plate immersed in solvent (LAiS). The ablation procedure was performed in 10 minutes steps by triplicate with cooling periods of 5 minutes between ablations. Comparatively particles were obtained under continuous ablation iron plate at different ablation times, 10, 20 and 30 min. The same procedure was utilized in both cases, LAiS and LAiGS. Nps of size ranging between 8 -10 nm were obtained by both methods. The particles exhibited a Resonance Plasmon Surface (RPS) band between 300 and 380 nm, typical of Fe NP in acid medium. In LAiS, an increment of particle size and in consequence a lower absorbance was observed when an irradiation wavelength of 532 nm was used. In LAiGS no dependence was observed between particles properties and irradiation wavelength, due to plasma plume is less dense. LAiSG method will be used to prepare NP in organic flammable solvents for obtaining good NP dispersions. This fact is useful in experiments where the presence of water is undesirable.

Palavras-chave : Nanoparticles; Laser ablation; Inert gas; Plasmonic Resonance; Organic Solvents.

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