CIOP   05384
CENTRO DE INVESTIGACIONES OPTICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
"Structure, configuration and sizing of Ni nanoparticles generated by ultrafast laser ablation in different media"
Autor/es:
MUÑETÓN ARBOLEDA, DAVID; SANTILLÁN, JESICA MARÍA JOSÉ; MENDOZA HERRERA, LUIS JOAQUÍN; FERNÁNDEZ VAN RAAP, MARCELA BEATRÍZ; MURACA, DIEGO; SCHINCA, DANIEL CARLOS; SCAFFARDI, LUCÍA BEATRÍZ
Lugar:
San Diego, California
Reunión:
Congreso; SPIE OPTICS + PHOTONICS: "NANOSCIENCE + ENGINNEERING"; 2015
Institución organizadora:
The International Society for Optics and Photonics (SPIE)
Resumen:
In recent years, nickelnanoparticles (Nps) have increased scientific interest because of theirextensive prospects in catalysts, conducting pastes, information storage,large-scale batteries and biomedicine.Several works on Ni Npsgeneration by laser ablation using different pulsed laser regimes and differentmedia have been published recently.However, there are noworks reporting on the use of fs-regime laser ablation of Ni in liquids and thecorresponding characterization of the obtained colloids. In this work weanalyze the characteristics of species, structure (bare core or core-shell),configuration and size distribution of Nps generated by fs pulse laser ablationover a Ni solid target in n-heptane and water. We report the presence of NiO-Nicore-shell and hollow Ni Nps in these colloids obtained, discussing a mechanismfor the formation of different species present in the colloidal suspensions.These were experimentally characterized using AFM and TEM microscopy, as wellas Optical Extinction Spectroscopy (OES). Extinction spectra were modeled usingMie theory through an appropriate modification of the complex experimentaldielectric function, taking into account a size-dependent corrective term foreach free and bound electron contribution. Experimental UV-visible-NIR spectra werereproduced considering a size distribution of bare core, hollow and core-shellstructures Nps. In bothmedia, Ni Nps shape and size distribution agrees with that derived from TEM andAFM analysis.