XVII-ICSMV

SYNTHESIS OF IRON (III) OXIDE AND AU NANOPARTICLES VIA LASER ABLATION OF SOLIDS IN LIQUIDS

Not scheduled

1h 30m

Museo Caracol (Ensenada, México)

Oral Nanostructures NANOSTRUCTURES

Speaker

Elder Alejandro Meza Ramírez (Departamento de Física, Centro Universitario de Ciencias Exactas e Ingenierías, Universidad de Guadalajara, Blvd. Gral. Marcelino García Barragán 1421, Olímpica, 44430, Guadalajara, Jalisco, México.)

Description

This work presents the results obtained from the synthesis of metallic Au and iron oxide nanoparticles through the laser ablation of a target immersed in different liquid media. Eight samples were synthesized using an Fe2O3 target, four different liquid media (acetone, bidistilled water, isopropanol, and ethanol), and two different laser intensities (475 and 640 mJ). Additionally, eight samples were obtained using a gold target and the same liquid media and laser intensities 475 and 710 mJ.
The results obtained from UV-vis spectroscopy Au samples synthesized in water and acetone media show an absorption maximum (520-550 nm), associated to the plasmonic resonance of this material, characteristic of small-sized nanoparticles.
TEM micrographs of both materials confirmed the synthesis of spherical nanoparticles. The Fe2O3 samples synthesized in water and ethanol exhibited greater size homogeneity, with a size of ∼50 nm. On the other hand, the micrographs of the gold samples, in accordance with UV-vis, confirmed that the nanoparticles synthesized in acetone and water had a narrow size distribution and a small particle size of ∼30 nm.
XPS confirmed the exclusive presence of iron species formed by Fe3+ ions in all samples, thus ruling out the presence of iron oxides other than Fe2O3. Concentration analysis showed that, besides Fe2O3, the samples contained species with Fe-OH bonds, with the H2O-60 and isopropanol-synthesized samples having the highest Fe2O3 rate.
It was possible to synthesize spherical Fe2O3 and Au nanoparticles using the laser ablation of solids in liquids technique. For Au, the liquid medium appears to have a significant influence on the size distribution of the synthesized samples, with acetone and water yielding the best results. Conversely, the iron oxide samples with the most homogeneous size distribution were those synthesized in ethanol and water, with the H2O-60 Fe2O3 sample demonstrating the best synthesis yield for this oxide.

This work was supported by

CONACYT and Universidad de Guadalajara.

Reference

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