Electrochemical synthesis of magnetite and maghemite nanoparticles using dissymmetric potential pulses
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Magnetic iron oxide nanoparticles of controlled size distribution were electrochemically synthesized applying a dissymmetric pattern of potential pulses to iron-based electrodes in aqueous media. The best pattern was determined through a design of experiments based on a previous voltammetric study. The applied method conveys an optimization of previous methods which employed direct or symmetric alternate potentials. XRD results indicate that magnetite phase is favored to anodic potentials larger −0.2 V versus SSE. TEM images show quasi spherical particles with size ranging from 10 to 50 nm, depending on the synthesis conditions, which agrees with size estimated from diffractograms. EDS indicate that the electrolyte is not totally eliminated by washing although its content is lower than 1 %.
KeywordsMagnetite nanoparticles Electrochemical synthesis Potential pulses
The authors thank the financial support of CONACYT and CONCYTEG for the development of this work through project GTO-2008-C03-91691. They also thank Dr. J. J. Pérez Bueno, Dr. L. A. Ortiz Frade, and Dr. F. Rodríguez Valadez for the facilities to achieve this investigation. A. Rodríguez-López acknowledges CONACYT and CENAM, México, the support for his Ph.D. studies.
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