Resumo

RIVERA-ESTEBAN, Jesús Manuel  e  OLIVAS-ALVAREZ, Agustin Benigno. Photoacustic study of gold nanoparticles by laser ablation. Tecnología en Marcha [online]. 2021, vol.34, n.2, pp.96-108. ISSN 0379-3982.  http://dx.doi.org/10.18845/tm.v34i2.5010.

In the present thesis, the change in morphology and size of gold nanoparticles obtained by laser ablation was investigated using different reconfiguration methods. In the case of gold, the target was ablated with a pulsed Nd: YAG laser, (1064 nm, 37.48 mJ/p, 10 Hz, during 10 minutes), the absorption spectra present a single absorption maximum at 521 nm characteristic of spherical gold nanoparticles. The PLI technique was applied to the colloids with laser pulses of 532 nm wavelength, 25.8 mJ of energy during 6 minutes. The analysis by dynamic dispersion of light (DLS) showed that the NpsAu with PLI were 21 nm in diameter. In addition, it was found that the amplitude of the photoacoustic signal is directly and proportionally related to the concentration of NpsAu on the colloid, showing that the higher the concentration, the greater the photoacoustic response. From the research it was concluded that the focused PLI technique applied to colloids with NpsAg presents new morphologies. In the case of gold, a change in size was found.

Palavras-chave : Photoacoustics; gold nanoparticles; laser ablation.

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