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Phase Transfer Identification of Core–Shell Structures in Ag–Au Bimetallic Nanoparticles

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Abstract:

The difference between the transfer of poly(vinylpyrrolidone)-protected Au and Ag nanoparticles from an aqueous solution to toluene was used to develop a simple experimental procedure that can positively identify the formation of bimetallic Ag–Au nanoparticles with the core–shell structure. The method was validated by UV–visible spectroscopy, EDX, and TEM measurements. Using this technique, we have found that core–shell nanoparticles of Ag–Au were formed by the seed-mediated growth method using Ag nanoparticles as the seeds. The reversed order of using Au nanoparticles as the seeds, on the contrary, could only produce a physical mixture of Ag–Au core–shell nanoparticles and isolated Ag nanoparticles.

Keywords: CORE-SHELL NANOPARTICLES; GOLD; PHASE TRANSFER; SEED-MEDIATED GROWTH; SILVER

Document Type: Research Article

DOI: https://doi.org/10.1166/jnn.2005.177

Publication date: 2005-07-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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