Ligand exchange in gold-coated FePt nanoparticles

In this work, we present the magnetic properties of gold-coated FePt nanoparticles and the study of stable aqueous dispersions of FePt@Au and FePt synthesized after ligand exchange with mercaptoundecanoic acid. The particle size determined from transmission electron microscopy (TEM) micrographs goes...

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Detalhes bibliográficos
Autores: Presa Muñoz De Toro, Patricia Marcela De La, Rueda, T., Morales, M. P., Hernando Grande, Antonio
Formato: artículo
Fecha de publicación:2008
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/52145
Acesso em linha:https://hdl.handle.net/20.500.14352/52145
Access Level:acceso abierto
Palavra-chave:538.9
Core-shell nanoparticles
Ftir
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
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oai_identifier_str oai:docta.ucm.es:20.500.14352/52145
network_acronym_str ES
network_name_str España
repository_id_str
spelling Ligand exchange in gold-coated FePt nanoparticlesPresa Muñoz De Toro, Patricia Marcela De LaRueda, T.Morales, M. P.Hernando Grande, Antonio538.9Core-shell nanoparticlesFtirFísica de materialesFísica del estado sólido2211 Física del Estado SólidoIn this work, we present the magnetic properties of gold-coated FePt nanoparticles and the study of stable aqueous dispersions of FePt@Au and FePt synthesized after ligand exchange with mercaptoundecanoic acid. The particle size determined from transmission electron microscopy (TEM) micrographs goes from 4 nm for the uncoated nanoparticles to a maximum of 10 nm for the gold-coated ones indicating that the thickness of the shell ranges from 1 to 3 nm. The magnetic characterization consists in hysteresis cycles at 10 and 300 K. The results show that, at low field and room temperature, the magnetic behavior of uncoated and coated nanoparticles are surprisingly quite similar. Because the gold-coated nanoparticles keep the magnetic properties of FePt and the presence of gold improves the functionalization of nanoparticles, the system is suitable for biological application. Mercaptoundecanoic ligand transfer was used to render water stable nanoparticles in a wide pH range. Transmission electron microscopy and dynamic light scattering (DLS) results show the nanoparticles slightly agglomerate after ligand exchange. Fourier transform infrared spectroscopy results suggest that thiol binds to the gold atoms of the surface.IEEE-Institute of Electrical and Electronics EngineersUniversidad Complutense de Madrid20082008-11-0120082008-11-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/52145reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/521452026-06-02T12:44:21Z
dc.title.none.fl_str_mv Ligand exchange in gold-coated FePt nanoparticles
title Ligand exchange in gold-coated FePt nanoparticles
spellingShingle Ligand exchange in gold-coated FePt nanoparticles
Presa Muñoz De Toro, Patricia Marcela De La
538.9
Core-shell nanoparticles
Ftir
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
title_short Ligand exchange in gold-coated FePt nanoparticles
title_full Ligand exchange in gold-coated FePt nanoparticles
title_fullStr Ligand exchange in gold-coated FePt nanoparticles
title_full_unstemmed Ligand exchange in gold-coated FePt nanoparticles
title_sort Ligand exchange in gold-coated FePt nanoparticles
dc.creator.none.fl_str_mv Presa Muñoz De Toro, Patricia Marcela De La
Rueda, T.
Morales, M. P.
Hernando Grande, Antonio
author Presa Muñoz De Toro, Patricia Marcela De La
author_facet Presa Muñoz De Toro, Patricia Marcela De La
Rueda, T.
Morales, M. P.
Hernando Grande, Antonio
author_role author
author2 Rueda, T.
Morales, M. P.
Hernando Grande, Antonio
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 538.9
Core-shell nanoparticles
Ftir
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
topic 538.9
Core-shell nanoparticles
Ftir
Física de materiales
Física del estado sólido
2211 Física del Estado Sólido
description In this work, we present the magnetic properties of gold-coated FePt nanoparticles and the study of stable aqueous dispersions of FePt@Au and FePt synthesized after ligand exchange with mercaptoundecanoic acid. The particle size determined from transmission electron microscopy (TEM) micrographs goes from 4 nm for the uncoated nanoparticles to a maximum of 10 nm for the gold-coated ones indicating that the thickness of the shell ranges from 1 to 3 nm. The magnetic characterization consists in hysteresis cycles at 10 and 300 K. The results show that, at low field and room temperature, the magnetic behavior of uncoated and coated nanoparticles are surprisingly quite similar. Because the gold-coated nanoparticles keep the magnetic properties of FePt and the presence of gold improves the functionalization of nanoparticles, the system is suitable for biological application. Mercaptoundecanoic ligand transfer was used to render water stable nanoparticles in a wide pH range. Transmission electron microscopy and dynamic light scattering (DLS) results show the nanoparticles slightly agglomerate after ligand exchange. Fourier transform infrared spectroscopy results suggest that thiol binds to the gold atoms of the surface.
publishDate 2008
dc.date.none.fl_str_mv 2008
2008-11-01
2008
2008-11-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/52145
url https://hdl.handle.net/20.500.14352/52145
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv IEEE-Institute of Electrical and Electronics Engineers
publisher.none.fl_str_mv IEEE-Institute of Electrical and Electronics Engineers
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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