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Magnetic and microstructural analysis of palladium nanoparticles with different capping systems

Opened Access Magnetic and microstructural analysis of palladium nanoparticles with different capping systems

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Autor: Litrán Ramos, Rocío
Sampedro, Blanca
Rojas Ruíz, Teresa Cristina
Multigner, Marta
Sánchez López, Juan Carlos
Crespo, Patricia
López Cartes, Carlos
García García, Miguel Ángel
Hernando, Antonio
Fernández Camacho, Asunción
Departamento: Universidad de Sevilla. Departamento de Química Inorgánica
Fecha: 2006
Publicado en: Physical Review B, 73, 1-7.
Tipo de documento: Artículo
Resumen: 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 dens...
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Cita: Litrán Ramos, R., Sampedro, B., Rojas Ruíz, T.C., Multigner, M., Sánchez López, J.C., Crespo, P.,...,Fernández Camacho, A. (2006). Magnetic and microstructural analysis of palladium nanoparticles with different capping systems. Physical Review B, 73, 1-7.
Tamaño: 410.6Kb
Formato: PDF

URI: https://hdl.handle.net/11441/73628

DOI: 10.1103/PhysRevB.73.054404

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