INTECIN   20395
INSTITUTO DE TECNOLOGIAS Y CIENCIAS DE LA INGENIERIA "HILARIO FERNANDEZ LONG"
Unidad Ejecutora - UE
artículos
Título:
Influence of silver concentrations on structural and magnetic properties of Ag-Fe3O4 heterodimer nanoparticles
Autor/es:
D. MURACA; S. K. SHARMA; L. M. SOCOLOVSKY; A. DE SIERVO; G. LOPES; K. R. PIROTA
Revista:
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Editorial:
AMER SCIENTIFIC PUBLISHERS
Referencias:
Lugar: California; Año: 2012 vol. 12 p. 6961 - 6967
ISSN:
1533-4880
Resumen:
In the present work, we have reported the effect of Ag NPs seeds on the growth and magnetic properties of Ag-Fe3O4 heterodimer nanoparticles prepared using a two step chemical approach. Three different Ag NPs concentrations have been tried and thoroughly characterized using small angle x-ray scattering (SAXS), transmission electron microscopy (TEM), x-ray diffraction (XRD), dc magnetization, and x-ray absorption near edge spectroscopy (XANES). It is observed that at low concentration, the "flower" types of nanoparticles are more favorable whereas the higher concentration of Ag NPs seeds promotes the growth of dimer type of structures. Our dc magnetization results are well correlated to the structural ones. The sample with lower amount of starting Ag NPs seeds possesses highest blocking and irreversibility temperature. On the other hand, the sample with highest concentration of Ag NPs seeds, the blocking temperature is lowered.