INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
"Characterization of magnetic nanoparticles synthesized ultrafast laser ablation"
MUÑETÓN ARBOLEDA, DAVID; MURACA, DIEGO; CORAL, DIEGO F.; SCHINCA, DANIEL CARLOS; SANTILLÁN, JESICA MARÍA JOSÉ; FERNÁNDEZ VAN RAAP, MARCELA BEATRÍZ; SCAFFARDI, LUCÍA BEATRÍZ
Otro; XVI Brazilian MRS Meeting; 2017
Magnetic nanoparticles have attracted much interest due to their broad applications in magnetic targeting of genes and cells, magnetic hyperthermia, contrast agents for magnetic resonance imaging, drug delivery and remediation of metal pollutants.One of the most active topics in nanotechnology is the synthesis, characterization, and functionalization of magnetic nanoparticles (MNPs). Although MNP fabrication techniques is a wide field, ultrashort pulse laser ablation of solids in liquids has emerged in recent years as a reliable, rapid, and green method for preparing NPs in suspensions, which are generally spherical in shape.In this work, the optical, magnetic, and structural characteristics of Ni and Fe colloids produced by ultrashort pulsed laser ablation of a solid target were studied in different liquid media. Optical extinction spectroscopy (OES), micro-Raman spectroscopy, atomic force microscopy (AFM), transmission electron microscopy (TEM), electron diffraction (ED) and vibrating sample magnetometry (VSM) were used to yield interrelated information. For the case of Ni, a theoretical analysis of the dependence of plasmon resonance of bare core and core-shell Ni NPs with core size and shell thickness provides insight about core-shell configurations: Ni-NiO and NiO-Ni. For Fe colloids, VSM showed nanoparticles in the superparamagnetic state, while OES revealed an absorption band in the UV region for all liquid solvents, in contrast to the results obtained with nanosecond lasers. Micro-Raman spectroscopy showed that the samples were heterogeneous in their composition, with hematite, maghemite, and magnetite nanoparticles in all solvents.