Magnetic and microstructural analysis of palladium nanoparticles with different capping systems

Palladium nanoparticles capped with different protective systems in a size range between 1.2 and 2.4 nm have been obtained by varying the preparation chemical method. Magnetization curves for all the samples show hysteresis loops, evidencing a ferromagnetic or a permanent magnetism in the nanopartic...

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Autores: Litrán, R., Sampedro, Blanca, Rojas, T. Cristina, Multigner, M., Sánchez-López, J.C., Crespo, Patricia, López-Cartes, C., García García-Tuñón, Miguel Ángel, Hernando, Antonio, Fernández-Camacho, A.
Tipo de recurso: artículo
Fecha de publicación:2006
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:dnet:digitalcsic_::fbfdf1cc88f3aef65abeff2c83275ae7
Acceso en línea:http://hdl.handle.net/10261/100749
Access Level:acceso abierto
Palabra clave:Gold nanoparticles
PD
Clusters
Ferromagnetism
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spelling Magnetic and microstructural analysis of palladium nanoparticles with different capping systemsLitrán, R.Sampedro, BlancaRojas, T. CristinaMultigner, M.Sánchez-López, J.C.Crespo, PatriciaLópez-Cartes, C.García García-Tuñón, Miguel ÁngelHernando, AntonioFernández-Camacho, A.Gold nanoparticlesPDClustersFerromagnetismPalladium nanoparticles capped with different protective systems in a size range between 1.2 and 2.4 nm have been obtained by varying the preparation chemical method. Magnetization curves for all the samples show hysteresis loops, evidencing a ferromagnetic or a permanent magnetism in the nanoparticles. The microstructure of the nanoparticles has been analyzed by x-ray absorption and transmission electron microscopy. The nature of the magnetic behavior found for all these Pd nanoparticles (NPs) is different depending on their sizes and structural features and is explained on the basis of two different suggested mechanisms. The particles protected by means of a surfactant (tetralkylammonium salts), present a ferromagnetic order related to the factors increasing the density of states just below the Fermi level. Whereas, when the nanoparticles are stabilized by covalent bonds with protective species (thiol derivatized alkane chains or surface oxidized Pd NPs), the increase of the 4d density of holes, localized by the bonded atoms (S or O), is giving rise to the observed ferromagneticlike behavior. © 2006 The American Physical Society.XAS facilities at BM29 in ESRF and the technical support from O. Mathon are acknowledged. The authors thank I. Rosa for technical assistance in sample preparation. Financial support from the Spanish MCyT and “Junta de Andalucía” is also acknowledged.Peer ReviewedAmerican Institute of PhysicsMinisterio de Ciencia y Tecnología (España)Junta de Andalucía2014201420062014info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/100749reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglésinfo:eu-repo/semantics/openAccessoai:dnet:digitalcsic_::fbfdf1cc88f3aef65abeff2c83275ae72026-05-22T06:33:51Z
dc.title.none.fl_str_mv Magnetic and microstructural analysis of palladium nanoparticles with different capping systems
title Magnetic and microstructural analysis of palladium nanoparticles with different capping systems
spellingShingle Magnetic and microstructural analysis of palladium nanoparticles with different capping systems
Litrán, R.
Gold nanoparticles
PD
Clusters
Ferromagnetism
title_short Magnetic and microstructural analysis of palladium nanoparticles with different capping systems
title_full Magnetic and microstructural analysis of palladium nanoparticles with different capping systems
title_fullStr Magnetic and microstructural analysis of palladium nanoparticles with different capping systems
title_full_unstemmed Magnetic and microstructural analysis of palladium nanoparticles with different capping systems
title_sort Magnetic and microstructural analysis of palladium nanoparticles with different capping systems
dc.creator.none.fl_str_mv Litrán, R.
Sampedro, Blanca
Rojas, T. Cristina
Multigner, M.
Sánchez-López, J.C.
Crespo, Patricia
López-Cartes, C.
García García-Tuñón, Miguel Ángel
Hernando, Antonio
Fernández-Camacho, A.
author Litrán, R.
author_facet Litrán, R.
Sampedro, Blanca
Rojas, T. Cristina
Multigner, M.
Sánchez-López, J.C.
Crespo, Patricia
López-Cartes, C.
García García-Tuñón, Miguel Ángel
Hernando, Antonio
Fernández-Camacho, A.
author_role author
author2 Sampedro, Blanca
Rojas, T. Cristina
Multigner, M.
Sánchez-López, J.C.
Crespo, Patricia
López-Cartes, C.
García García-Tuñón, Miguel Ángel
Hernando, Antonio
Fernández-Camacho, A.
author2_role author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia y Tecnología (España)
Junta de Andalucía
dc.subject.none.fl_str_mv Gold nanoparticles
PD
Clusters
Ferromagnetism
topic Gold nanoparticles
PD
Clusters
Ferromagnetism
description Palladium nanoparticles capped with different protective systems in a size range between 1.2 and 2.4 nm have been obtained by varying the preparation chemical method. Magnetization curves for all the samples show hysteresis loops, evidencing a ferromagnetic or a permanent magnetism in the nanoparticles. The microstructure of the nanoparticles has been analyzed by x-ray absorption and transmission electron microscopy. The nature of the magnetic behavior found for all these Pd nanoparticles (NPs) is different depending on their sizes and structural features and is explained on the basis of two different suggested mechanisms. The particles protected by means of a surfactant (tetralkylammonium salts), present a ferromagnetic order related to the factors increasing the density of states just below the Fermi level. Whereas, when the nanoparticles are stabilized by covalent bonds with protective species (thiol derivatized alkane chains or surface oxidized Pd NPs), the increase of the 4d density of holes, localized by the bonded atoms (S or O), is giving rise to the observed ferromagneticlike behavior. © 2006 The American Physical Society.
publishDate 2006
dc.date.none.fl_str_mv 2006
2014
2014
2014
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/100749
url http://hdl.handle.net/10261/100749
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Institute of Physics
publisher.none.fl_str_mv American Institute of Physics
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869408940057427968
score 15.811543

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