Lester Brown - One-Pot Aqueous Synthesis of Fe and Ag Core/Shell Nanoparticles

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  Publication Details (including relevant citation   information):

  Chem. Mater. 2010, 22, 6291–6296 6291


  Received July 18, 2010. Revised Manuscript Received October 1,   2010


  This article investigates a facile one-pot method for the   synthesis of Fe and Ag core/shell nanoparticles by aqueous   reduction under ambient conditions. We have shown that the   injection time of silver nitrate into a reaction vessel   containing aqueous ferrous salt, sodium borohydride, and sodium

  citrate is a vital parameter for the precise control of a desired   core/shell structure. For example, if silver nitrate is injected   one minute after sodium borohydride is added to the reaction   vessel, Ag will nucleate first followed by Fe, creating   monodisperse Ag/Fe core/shell nanoparticles. In contrast, if

  the introduction time is prolonged to 5 min, Fe nanoparticles   will nucleate followed by Ag producing Fe/Ag nanoparticles. The   composition, morphology, and magnetic behavior were investigated   by X-ray absorption spectroscopy (XAS), X-ray photoelectron   spectroscopy (XPS), X-ray diffraction

  (XRD), transmission electron microscopy (TEM), and   room-temperature vibrating sample magnetometry (VSM). Fe/Ag   core/shell nanoparticles with optical and magnetic functionality   offer broad opportunities in medicine, catalysis, and chemical   detection.

  Address (URL): http://http://dcg.materials.drexel.edu/wp-content/publications/ChemMat_Vol22.pdf