One-Pot Aqueous Synthesis of Fe and Ag Core/Shell Nanoparticles
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- 作者：Kyler J. Carroll ; Daniel M. Hudgins ; Steven Spurgeon ; Kennneth M. Kemner ; Bhoopesh Mishra ; Maxim I. Boyanov ; Lester W. Brown ; III ; Mitra L. Taheri ; Everett E. Carpenter
- 刊名：Chemistry of Materials
- 出版年：2010
- 出版时间：December 14, 2010
- 年：2010
- 卷：22
- 期：23
- 页码：6291-6296
- 全文大小：825K
- 年卷期：v.22,no.23(December 14, 2010)
- ISSN：1520-5002
文摘
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.