RT Journal Article
T1 Magnetic and microstructural analysis of palladium nanoparticles with different capping systems
A1 Litrán, R.
A1 Sampedro, B.
A1 Rojas, , T. C.
A1 Multigner, M.
A1 Sánchez López, J. C.
A1 Crespo del Arco, Patricia
A1 López Cartes, C.
A1 García, M. A.
A1 Hernando Grande, Antonio
A1 Fernández, A.
AB 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.
PB American Physical Society
SN 1098-0121
YR 2006
FD 2006-02
LK https://hdl.handle.net/20.500.14352/52014
UL https://hdl.handle.net/20.500.14352/52014
LA eng
NO ©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  rom the Spanish MCyT and “Junta de Andalucía” is also  acknowledged.
NO Spanish MCyT
NO Junta de Andalucía
DS Docta Complutense
RD 7 abr 2025