Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/344967
Type: Artigo
Title: Optical and magnetic properties of Fe nanoparticles fabricated by femtosecond laser ablation in organic and inorganic solvents
Author: Santillán, J. M. J.
Arboleda, D. M.
Coral, D. F.
Fernandez van Raap, M. B.
Muraca, D.
Schinca, D. C.
Scaffardi, L. B.
Abstract: 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 alpha-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.
Subject: Fractais
Ferro
Ablação a laser
Propriedades magnéticas
Nanopartículas
Fractals
Iron
Laser ablation
Magnetic properties
Nanoparticles
Country: Alemanha
Editor: Wiley-VCH Verlag
Rights: fechado
Identifier DOI: 10.1002/cphc.201601279
Address: https://chemistry-europe.onlinelibrary.wiley.com/doi/full/10.1002/cphc.201601279
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos

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