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Optical and Magnetic Properties of Fe Nanoparticles Fabricated by Femtosecond Laser Ablation in Organic and Inorganic Solvents
Author(s) -
Santillán Jesica M. J.,
Muñetón Arboleda David,
Coral Diego F.,
Fernández van Raap Marcela B.,
Muraca Diego,
Schinca Daniel C.,
Scaffardi Lucía B.
Publication year - 2017
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201601279
Subject(s) - materials science , nanoparticle , maghemite , superparamagnetism , iron oxide nanoparticles , laser ablation , raman spectroscopy , magnetic nanoparticles , analytical chemistry (journal) , laser ablation synthesis in solution , nanotechnology , chemical engineering , chemistry , laser , laser power scaling , magnetization , optics , organic chemistry , physics , engineering , quantum mechanics , x ray laser , magnetic field
Magnetic nanoparticles have attracted much interest due to their broad applications in biomedicine and pollutant remediation. In this work, the optical, magnetic, and structural characteristics of colloids produced by ultrashort pulsed laser ablation of a solid Fe target were studied in four different media: HPLC water, an aqueous solution of trisodium citrate, acetone, and ethanol. Optical extinction spectroscopy revealed an absorption band in the UV region for all, in contrast to the results obtained with nanosecond lasers. Micro‐Raman spectroscopy showed that the samples are heterogeneous in their composition, with hematite, maghemite, and magnetite nanoparticles in all four solvents. Similar results were obtained by electron diffraction, which also found α‐Fe. Magnetic properties were studied by vibrating‐sample magnetometry, and showed nanoparticles in the superparamagnetic state. Under certain experimental conditions, submicrometer‐sized iron oxide nanoparticles agglomerate into fractal patterns that show self‐similar properties. Self‐assembled annular structures on the nanometer scale were also observed and are reported for the first time.