Bimetallic Alloy of Fe 2 O 3 -Ag Nanoparticles: Characterization and Structural Modeling
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Bimetallic Alloy of Fe2O3-Ag Nanoparticles: Characterization and Structural Modeling A. Ruíz-Baltazar 1, R. Esparza1, J.L López-Miranda2, G. Rosas2, R. Pérez1 1
Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, Boulevard Juriquilla 3001,76230 Santiago de Querétaro, QRO, México. 2 Instituto de Investigaciones Metalúrgicas, Universidad Michoacana, C.U. C.P: 77000, Morelia, México. Email: [email protected] ABSTRACT The synthesis of Fe3O4-Ag bimetallic nanoparticles by chemical reduction was carried out. Fe nanoparticles were obtained using Fe (III) Chloride hexahydrate (FeCl3•6H2O) as precursor and sodium borohydride (NaBH4) as reducing agent, subsequently, a solution of silver nitrate (AgNO3) was added to the reaction. The synthesis methodology employed in this case, is a modification of chemical reduction method. Through this procedure has been possible simplify the synthesis route used to obtain bimetallic systems such as Fe3O4-Ag. Particles with semispherical morphology were observed. High-resolution transmission electron microscopy (HREM), ultraviolet visible spectroscopy (UV-is) and quasi-elastic light scattering (QELS) techniques were employed for the structural characterization of Fe3O4-Ag nanostructures. Some models presented describe and prove the formation of the Fe3O4-Ag alloy type structures. INTRODUCTION The metallic nanoparticles have a special interest due to the wide range of properties and potential applications in the fields of physics, chemistry, materials science, biology and catalysis [1-4]. Specifically, bimetallic nanoparticles of fera feasible alternative for the potentiation of the metallic properties of the nanoparticles. This is due to these composites consist of two combined nanoparticles with different functionalities with a common interface. Interfacial interactions in these systems lead to changes in the physical and chemical properties of the bimetallic nanoparticles. Consequently, research of new synthesis routes bimetallic nanoparticles is fundamental in the development of nanotechnology. Specially the Fe-Ag dumbbell-like nanoparticles possess the surface character of Ag and the magnetic property of Fe, and hence might have great potential applications in biological targeting, biological separation, high-density magnetic recording, catalysis, and targeting therapy fields in the near future [2]. Moreover, the preparation and properties of Fe-Ag composite magnetic nanoparticles have been reported a few [3]. Different experimental methods to produce dumbbell-like nanostructures have been reported in the literature [2, 3]. However, the chemical method has been employed too successfully in the synthesis of these bimetallic nanostructures [5, 6, 9]. In this work, a chemical synthesis was carry on to produce Fe-Ag dumbbell-like nanoparticles by the reduction of (FeCl3•6H2O) and AgNO3 using sodium borohydride NaBH4 as a reducing agent.
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