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Tuning the Magnetic Properties of Metal Oxide Nanocrystal Heterostructures by Cation Exchange

[Image: see text] For three types of colloidal magnetic nanocrystals, we demonstrate that postsynthetic cation exchange enables tuning of the nanocrystal’s magnetic properties and achieving characteristics not obtainable by conventional synthetic routes. While the cation exchange procedure, performe...

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Autores principales: Sytnyk, Mykhailo, Kirchschlager, Raimund, Bodnarchuk, Maryna I., Primetzhofer, Daniel, Kriegner, Dominik, Enser, Herbert, Stangl, Julian, Bauer, Peter, Voith, Michael, Hassel, Achim Walter, Krumeich, Frank, Ludwig, Frank, Meingast, Arno, Kothleitner, Gerald, Kovalenko, Maksym V., Heiss, Wolfgang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2013
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3573734/
https://www.ncbi.nlm.nih.gov/pubmed/23362940
http://dx.doi.org/10.1021/nl304115r
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author Sytnyk, Mykhailo
Kirchschlager, Raimund
Bodnarchuk, Maryna I.
Primetzhofer, Daniel
Kriegner, Dominik
Enser, Herbert
Stangl, Julian
Bauer, Peter
Voith, Michael
Hassel, Achim Walter
Krumeich, Frank
Ludwig, Frank
Meingast, Arno
Kothleitner, Gerald
Kovalenko, Maksym V.
Heiss, Wolfgang
author_facet Sytnyk, Mykhailo
Kirchschlager, Raimund
Bodnarchuk, Maryna I.
Primetzhofer, Daniel
Kriegner, Dominik
Enser, Herbert
Stangl, Julian
Bauer, Peter
Voith, Michael
Hassel, Achim Walter
Krumeich, Frank
Ludwig, Frank
Meingast, Arno
Kothleitner, Gerald
Kovalenko, Maksym V.
Heiss, Wolfgang
author_sort Sytnyk, Mykhailo
collection PubMed
description [Image: see text] For three types of colloidal magnetic nanocrystals, we demonstrate that postsynthetic cation exchange enables tuning of the nanocrystal’s magnetic properties and achieving characteristics not obtainable by conventional synthetic routes. While the cation exchange procedure, performed in solution phase approach, was restricted so far to chalcogenide based semiconductor nanocrystals, here ferrite-based nanocrystals were subjected to a Fe(2+) to Co(2+) cation exchange procedure. This allows tracing of the compositional modifications by systematic and detailed magnetic characterization. In homogeneous magnetite nanocrystals and in gold/magnetite core shell nanocrystals the cation exchange increases the coercivity field, the remanence magnetization, as well as the superparamagnetic blocking temperature. For core/shell nanoheterostructures a selective doping of either the shell or predominantly of the core with Co(2+) is demonstrated. By applying the cation exchange to FeO/CoFe(2)O(4) core/shell nanocrystals the Neél temperature of the core material is increased and exchange-bias effects are enhanced so that vertical shifts of the hysteresis loops are obtained which are superior to those in any other system.
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spelling pubmed-35737342013-02-19 Tuning the Magnetic Properties of Metal Oxide Nanocrystal Heterostructures by Cation Exchange Sytnyk, Mykhailo Kirchschlager, Raimund Bodnarchuk, Maryna I. Primetzhofer, Daniel Kriegner, Dominik Enser, Herbert Stangl, Julian Bauer, Peter Voith, Michael Hassel, Achim Walter Krumeich, Frank Ludwig, Frank Meingast, Arno Kothleitner, Gerald Kovalenko, Maksym V. Heiss, Wolfgang Nano Lett [Image: see text] For three types of colloidal magnetic nanocrystals, we demonstrate that postsynthetic cation exchange enables tuning of the nanocrystal’s magnetic properties and achieving characteristics not obtainable by conventional synthetic routes. While the cation exchange procedure, performed in solution phase approach, was restricted so far to chalcogenide based semiconductor nanocrystals, here ferrite-based nanocrystals were subjected to a Fe(2+) to Co(2+) cation exchange procedure. This allows tracing of the compositional modifications by systematic and detailed magnetic characterization. In homogeneous magnetite nanocrystals and in gold/magnetite core shell nanocrystals the cation exchange increases the coercivity field, the remanence magnetization, as well as the superparamagnetic blocking temperature. For core/shell nanoheterostructures a selective doping of either the shell or predominantly of the core with Co(2+) is demonstrated. By applying the cation exchange to FeO/CoFe(2)O(4) core/shell nanocrystals the Neél temperature of the core material is increased and exchange-bias effects are enhanced so that vertical shifts of the hysteresis loops are obtained which are superior to those in any other system. American Chemical Society 2013-01-30 2013-02-13 /pmc/articles/PMC3573734/ /pubmed/23362940 http://dx.doi.org/10.1021/nl304115r Text en Copyright © 2013 American Chemical Society Terms of Use (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html)
spellingShingle Sytnyk, Mykhailo
Kirchschlager, Raimund
Bodnarchuk, Maryna I.
Primetzhofer, Daniel
Kriegner, Dominik
Enser, Herbert
Stangl, Julian
Bauer, Peter
Voith, Michael
Hassel, Achim Walter
Krumeich, Frank
Ludwig, Frank
Meingast, Arno
Kothleitner, Gerald
Kovalenko, Maksym V.
Heiss, Wolfgang
Tuning the Magnetic Properties of Metal Oxide Nanocrystal Heterostructures by Cation Exchange
title Tuning the Magnetic Properties of Metal Oxide Nanocrystal Heterostructures by Cation Exchange
title_full Tuning the Magnetic Properties of Metal Oxide Nanocrystal Heterostructures by Cation Exchange
title_fullStr Tuning the Magnetic Properties of Metal Oxide Nanocrystal Heterostructures by Cation Exchange
title_full_unstemmed Tuning the Magnetic Properties of Metal Oxide Nanocrystal Heterostructures by Cation Exchange
title_short Tuning the Magnetic Properties of Metal Oxide Nanocrystal Heterostructures by Cation Exchange
title_sort tuning the magnetic properties of metal oxide nanocrystal heterostructures by cation exchange
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3573734/
https://www.ncbi.nlm.nih.gov/pubmed/23362940
http://dx.doi.org/10.1021/nl304115r
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