RT Journal Article
T1 Magnetometry and electron paramagnetic resonance studies of phosphine- and thiol-capped gold nanoparticles
A1 Guerrero, E.
A1 Munoz-Marquez, M. A.
A1 Fernández, A.
A1 Crespo del Arco, Patricia
A1 Hernando, A.
A1 Lucena, R.
A1 Conesa, J. C.
AB In the last years, the number of studies performed by wholly independent research groups that confirm the permanent magnetism, first observed in our research lab, for thiol-capped Au nanoparticles (NPs) has rapidly increased. Throughout the years, the initial magnetometry studies have been completed with element-specific magnetization measurements based on, for example, the x-ray magnetic circular dichroism technique that have allowed the identification of gold as the magnetic moment carrier. In the research work here presented, we have focused our efforts in the evaluation of the magnetic behavior and iron impurities content in the synthesized samples by means of superconducting quantum interference device magnetometry and electron paramagnetic resonance spectrometry, respectively. As a result, hysteresis cycles typical of a ferromagnetic material have been measured from nominally iron-free gold NPs protected with thiol, phosphine, and chlorine ligands. It is also observed that for samples containing both, capped gold NPs and highly diluted iron concentrations, the magnetic behavior of the NPs is not affected by the presence of paramagnetic iron impurities. The hysteresis cycles reported for phosphine-chlorine- capped gold NPs confirm that the magnetic behavior is not exclusively for the metal-thiol system.
PB American Institute of Physics
SN 0021-8979
YR 2010
FD 2010-03-15
LK https://hdl.handle.net/20.500.14352/42611
UL https://hdl.handle.net/20.500.14352/42611
LA eng
NO © 2010 American Institute of Physics.This research has been supported by the Spanish MECINN  Project Consolider-Ingenio in Molecular Nanoscience, CSD2007-00010 and “Junta de Andalucía”  Project Nos. P06-FQM-02254 and P09- FQM-4554, group TEP217. EG thanks the Spanish MEC for financial support and MAMM acknowledges the CSIC I3P program. R. L. thanks CSIC for a PhD grant.
NO Ministerio de Ciencia e Innovación (MICINN)
NO Junta de Andalucia
NO Spanish MEC
NO CSIC
DS Docta Complutense
RD 29 abr 2024