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Title: One-step room temperature synthesis of very small γ-Fe{sub 2}O{sub 3} nanoparticles

Abstract

Graphical abstract: - Highlights: • One-step synthesis of 3 nm maghemite nanoparticles is reported. • Maghemite nanoparticles can be synthesized from a ferric solution. • γ-Fe{sub 2}O{sub 3} NPs can be obtained if the precursor has Fe(III) in tetrahedral interstices. • HR-TEM, Mössbauer, XAFS and magnetometry analysis proved the maghemite existence - Abstract: Very small maghemite nanoparticles (∼3 nm) are obtained through a one-step synthesis at room temperature. The fast neutralization reaction of a ferric solution in a basic medium produces an intermediate phase, presumably two-line ferrihydrite, which in oxidizing conditions is transformed to maghemite nanoparticles. The synthesis of maghemite, as final product of the reaction, was characterized by High-Resolution Transmission Electron Microscopy (HR-TEM), X-ray Absorption Fine Structure (XAFS), Mössbauer spectroscopy, and magnetometry. The XAFS technique allowed the analysis of the crystallographic variations into maghemite nanoparticles as a result of modification in its surface/volume ratio. Mössbauer spectroscopy at low temperature (4.2 K) confirms the presence of Fe(III) in tetrahedral and octahedral interstices, in the stoichiometry corresponding to maghemite. The specific magnetization, M vs H (3 K and 300 K, up to 7 T) and temperature dependence of the magnetization (50 Oe by ZFC mode, 2 K ≤ T ≤ 300more » K) indicate that maghemite nanoparticles of 3 nm are in superparamagnetic state with a blocking temperature close to 36 K.« less

Authors:
 [1];  [1];  [1];  [1];  [2]; ;  [1]
  1. Laboratorio de Sólidos Amorfos, INTECIN, Facultad de Ingeniería, Universidad de Buenos Aires, C1063ACV, Buenos Aires (Argentina)
  2. Instituto de Materiales y Reactivos, Universidad de La Habana, CP10400, Ciudad Habana (Cuba)
Publication Date:
OSTI Identifier:
22341788
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 48; Journal Issue: 9; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; ABSORPTION SPECTROSCOPY; FERRITES; FINE STRUCTURE; IRON OXIDES; MAGNETIZATION; NANOPARTICLES; SUPERPARAMAGNETISM; SYNTHESIS; TEMPERATURE DEPENDENCE; TRANSMISSION ELECTRON MICROSCOPY; X RADIATION; X-RAY SPECTROSCOPY

Citation Formats

Moscoso-Londoño, O., Carrião, M. S., Instituto de Física, Campus II, Universidade Federal de Goiás, CEP: 74001-970 Goiânia, Cosio-Castañeda, C., Departamento de Física y Química Teórica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, D.F. 04510, Bilovol, V., Sánchez, R. Martínez, Lede, E. J., Socolovsky, L. M., and Martínez-García, R., E-mail: rmartinez@fi.uba.ar. One-step room temperature synthesis of very small γ-Fe{sub 2}O{sub 3} nanoparticles. United States: N. p., 2013. Web. doi:10.1016/J.MATERRESBULL.2013.05.042.
Moscoso-Londoño, O., Carrião, M. S., Instituto de Física, Campus II, Universidade Federal de Goiás, CEP: 74001-970 Goiânia, Cosio-Castañeda, C., Departamento de Física y Química Teórica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, D.F. 04510, Bilovol, V., Sánchez, R. Martínez, Lede, E. J., Socolovsky, L. M., & Martínez-García, R., E-mail: rmartinez@fi.uba.ar. One-step room temperature synthesis of very small γ-Fe{sub 2}O{sub 3} nanoparticles. United States. doi:10.1016/J.MATERRESBULL.2013.05.042.
Moscoso-Londoño, O., Carrião, M. S., Instituto de Física, Campus II, Universidade Federal de Goiás, CEP: 74001-970 Goiânia, Cosio-Castañeda, C., Departamento de Física y Química Teórica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, D.F. 04510, Bilovol, V., Sánchez, R. Martínez, Lede, E. J., Socolovsky, L. M., and Martínez-García, R., E-mail: rmartinez@fi.uba.ar. Sun . "One-step room temperature synthesis of very small γ-Fe{sub 2}O{sub 3} nanoparticles". United States. doi:10.1016/J.MATERRESBULL.2013.05.042.
@article{osti_22341788,
title = {One-step room temperature synthesis of very small γ-Fe{sub 2}O{sub 3} nanoparticles},
author = {Moscoso-Londoño, O. and Carrião, M. S. and Instituto de Física, Campus II, Universidade Federal de Goiás, CEP: 74001-970 Goiânia and Cosio-Castañeda, C. and Departamento de Física y Química Teórica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, D.F. 04510 and Bilovol, V. and Sánchez, R. Martínez and Lede, E. J. and Socolovsky, L. M. and Martínez-García, R., E-mail: rmartinez@fi.uba.ar},
abstractNote = {Graphical abstract: - Highlights: • One-step synthesis of 3 nm maghemite nanoparticles is reported. • Maghemite nanoparticles can be synthesized from a ferric solution. • γ-Fe{sub 2}O{sub 3} NPs can be obtained if the precursor has Fe(III) in tetrahedral interstices. • HR-TEM, Mössbauer, XAFS and magnetometry analysis proved the maghemite existence - Abstract: Very small maghemite nanoparticles (∼3 nm) are obtained through a one-step synthesis at room temperature. The fast neutralization reaction of a ferric solution in a basic medium produces an intermediate phase, presumably two-line ferrihydrite, which in oxidizing conditions is transformed to maghemite nanoparticles. The synthesis of maghemite, as final product of the reaction, was characterized by High-Resolution Transmission Electron Microscopy (HR-TEM), X-ray Absorption Fine Structure (XAFS), Mössbauer spectroscopy, and magnetometry. The XAFS technique allowed the analysis of the crystallographic variations into maghemite nanoparticles as a result of modification in its surface/volume ratio. Mössbauer spectroscopy at low temperature (4.2 K) confirms the presence of Fe(III) in tetrahedral and octahedral interstices, in the stoichiometry corresponding to maghemite. The specific magnetization, M vs H (3 K and 300 K, up to 7 T) and temperature dependence of the magnetization (50 Oe by ZFC mode, 2 K ≤ T ≤ 300 K) indicate that maghemite nanoparticles of 3 nm are in superparamagnetic state with a blocking temperature close to 36 K.},
doi = {10.1016/J.MATERRESBULL.2013.05.042},
journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 9,
volume = 48,
place = {United States},
year = {2013},
month = {9}
}