PhysicoChemical Studies of Complex Silver-Magnetite Nano Heterodimers with Controlled Morphology

O. MOSCOSO LONDOÑO; D. MURACA; P. TANCREDI; C. COSIO-CASTAÑEDA; K. R. PIROTA; L. M. SOCOLOVSKY

JOURNAL OF PHYSICAL CHEMISTRY C

AMER CHEMICAL SOC

Lugar: Washington; Año: 2014

1932-7447

The influence of synthesis conditions on self-assembly capability and morphology of obtained Ag?Fe3O4 nano-heterostructures is discussed in this work. Samples were synthesized in two steps, first were synthesized silver nanoparticles, used as seeds for the growth of iron oxide nanoparticles in a second step. The silver nanoparticles size was tuned changing the oleylamine (OAm) and oleic acid (OA) ratio, which us to study the influence of chemical agents and seed size on the final magnetic nanoparticles morphology. The mechanism during the formation of these heterostructures has been discussed by several authors, however it still remains as an open issue. In this paper we extend the discussion and advance on the understanding of synthesis condition, related to silver sizes, chemical agents and physical properties on the obtained nanoparticles. In our Ag-Fe3O4 system, two types of heterostructures were obtained; dimer, flower or their combination. We have found that the final shape depends on silver seed size, as well the polarity of the chemical agents used during the synthesis. We made an exhaustive study of the relationship between magnetic properties and structural features. The morphology and size distributions of the heterostructures have been analyzed by transmission electron microscopy (TEM).