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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...
Autores principales: | , , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical
Society
2013
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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. |
format | Online Article Text |
id | pubmed-3573734 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | American Chemical
Society |
record_format | MEDLINE/PubMed |
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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